How Hashimoto’s Symptoms change over time + “Flare up" Symptoms

How Hashimoto’s Symptoms change over time + “Flare up” Symptoms

Hashimoto's symptoms can vary drastically from person to person. 

Couple that with the fact that the symptoms of Hashimoto's disease change through time and can "flare" due to certain triggers makes the disease even more difficult to diagnose and manage.

It turns out that your symptoms may be telling you something about your body and can help you determine the source and cause of your Hashimoto's disease.

Managing and treating the autoimmunity and inflammatory aspect of Hashimoto's is critical for reducing these symptoms.

Let's dive in:

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Progression of Symptoms in Hashimoto's Patients

Hashimoto's and autoimmune thyroiditis should be differentiated from other causes of hypothyroidism. 


Because autoimmune thyroiditis should be treated differently.

While it's true that some patients with Hashimoto's and autoimmune thyroiditis may need thyroid hormone replacement, this statement is not true for ALL patients with this disease. 

Instead of focusing on the thyroid hormones and values, your focus should instead be on the autoimmunity and inflammatory component.

Autoimmunity indicates a deeper problem in the body.

The inability to recognize self from non-self, and an imbalance in the immune system.

This component is usually triggered by various factors (usually a combination of factors that we will discuss later) that results in dysregulation of this system.

warnings signs of hashimotos low res

Physiologically this causes a variety of symptoms ranging from general and diffuse non-specific symptoms to alternating symptoms of both hypothyroidism and hyperthyroidism. 

These issues result in a disease that can be both difficult to diagnose and manage (unless your provider knows to be looking for it). 

In fact, many patients with hypothyroidism likely have some component of autoimmune thyroiditis - they just have never been diagnosed.

  • Bottom line: The symptoms of Hashimoto's and autoimmune thyroiditis differ from hypothyroidism due to both the inflammatory and autoimmune component of this disease. These two factors change how Hashimoto's should be managed. 

Fluctuations in TSH and T4 over time

Many of the symptoms of Hashimoto's can be traced back to 2 main areas:

  • Changes and fluctuations in thyroid hormone
  • Fluctuations in inflammatory markers

We will talk about both and how they can impact your symptoms:

You can see an example below of how both TSH and FT4 can fluctuate throughout time: 

TSH fluctuating over time with autoimmune thyroiditis

The blue line represents FT4 which you can see varies as much as 6 times between laboratory results. 

The FT4 level tends to be inversely proportional to the TSH (meaning as FT4 level increases the TSH level decreases). 

The TSH in the pink line varies from episodes of hypothyroidism (high levels of TSH) to nearly suppressed levels (episodes of hyperthyroidism) throughout time.

This variance in thyroid hormone levels can often trick both patients and providers which results in constant changes to thyroid hormone and various symptoms in the patient.

When in reality the focus should be on the autoimmune and inflammatory component and NOT the thyroid hormone themselves.

It's easy to see how thyroid hormone levels directly impact your symptoms so we will move to the second factor which is changes in your inflammatory markers. 

Inflammatory changes cause a variety of symptoms related to your thyroid and related to other hormone systems in the body. 

Inflammation by itself can cause a reduction in T4 to T3 conversion (1) (leading to worsening symptoms of hypothyroidism). 

Inflammation can also potentiate insulin resistance (2) and make adrenal function worse.

These changes may lead to symptoms such as weight gain (3), fatigue and neurological symptoms that may complicate or worsen existing hypothyroid/hyperthyroid like symptoms. 

Your inflammatory status can be measured and tracked by checking non-specific markers in the blood including: 

  • Erythrocyte sedimentation rate (ESR)
  • C reactive protein (CRP)
  • Ferritin
  • Thyroid antibodies and other antibody levels

The elevation of these markers (while not specific) indicate dysfunction in the body and may make the symptoms of Hashimoto's worse. 

Now let's discuss how these two component changes and alter the progression of the symptoms of Hashimoto's over time...

  • Bottom line: The combination of inflammation and autoimmunity cause variations in thyroid function and other hormone function in the body. This is part of the reason that this disease causes symptoms to change over time. 

Generalized and non-specific symptoms -> Symptoms start here

The symptoms of Hashimoto's usually start out somewhat fatigue and diffuse. 

Because of these symptoms, it can be difficult to pinpoint where your symptoms are coming from.

You may present with a mild weight gain of 5-10 pounds, or maybe just some mild fatigue.

The issue is that most patients know that something is "off" in their body, but when they go to their physician they usually undergo "standard" lab tests that don't identify the problem.

Or worse, the provider will identify the presence of antibodies like anti-TPO thyroid antibodies but take the "wait and see" approach to management.

The symptoms generally start out somewhat mild due to the low-grade inflammation and autoimmunity that is present. 

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At this point there isn't usually significant damage to the thyroid gland, so most damage at this point is reversible if treated correctly.

It also means that undergoing treatment at this point is critical.

Because any treatment you can do to help lower the inflammation and autoimmunity will go a long way to helping reduce long term thyroid damage and reliance upon thyroid hormone later in life.

How Hashimoto's symptoms start:

  • General fatigue or sensation of being "run-down"
  • Mild weight gain (usually 5-10 pounds)
  • Flat affect or depressed mood, not feeling like yourself
  • Mild difficulty with concentration or inability to focus
  • Dry skin, cracked lips, dry & brittle hair, non-specific rashes or patches on the skin
  • Mild constipation
  • Mild fluid retention (especially in the face and lower extremities)
  • Voice hoarseness or sensation of a "swollen throat"
  • Reduction in sweating or inability to sweat
  • Mild joint pain or muscle aches
  • Mild to moderate changes to the menstrual cycle including irregular cycle and/or reduced/increased flow

If you are experiencing any of the symptoms listed below make sure to get your antibody levels checked, and not only that but continue to follow them as you undergo treatment.

This will help to determine if you are on the right track.

This is only the start of the symptoms of Hashimoto's however, and symptoms may fluctuate between hyperthyroidism and hypothyroidism which I will go over below. 

  • Bottom line: The initial symptoms of Hashimoto's tend to be vague and diffuse making the diagnosis difficult. Treatment at this early stage is critical, however, because you can prevent long term reliance upon thyroid hormone later in life if you can stop the damage early. 

Progression through hyperthyroidism and hypothyroidism

Many patients, unfortunately, can go years (or decades) without a diagnosis of Hashimoto's or autoimmune thyroiditis. 

During this time some patients will experience swings or episodes of hyperthyroidism followed by episodes of hypothyroidism.

This can occur as a result of the damage done to the thyroid gland by thyroid antibodies.

As antibodies attach to the thyroid gland your body will react in turn with an inflammatory response that may damage or injure the thyroid gland.

The thyroid as a gland has a job to release hormones under a stimulus. And this stimulus can be triggered by the damage and cause a "flush" of thyroid hormones to be released from the body. 

This flush can temporarily trigger symptoms of hyperthyroidism which can make symptoms worse (especially if the patient is already on thyroid medication).

Symptoms that mimic episodes of hyperthyroidism or a "flush" of thyroid hormones in the bloodstream/body: 

  • Hot flashes or episodes of heat intolerance
  • Mood changes, typically on the anxiety spectrum
  • Jittery sensation or sensation of "too much energy"
  • Fatigue or episodes of energy swings (up and down)
  • Difficulty sleeping or episodes of insomnia
  • Facial flushing or sensation of warm extremities
  • Heart palpitations or sensation of racing pulse (usually episodic and at night but can occur at any time throughout the day)
  • Weight loss/weight gain accompanied by changes in appetite

These symptoms do not occur in every patient, however. 

Some patients just have a chronic and continuing decline in thyroid hormone throughout time, but some experience these episodes of "ups" and "downs".

It's important to realize that the presence of these symptoms may also indicate antibodies that directly stimulate the release of thyroid hormone from the body (it isn't always caused just by the inflammatory component).

  • Bottom line: The inflammatory component of Hashimoto's may trigger a "flush" or release of thyroid hormones into the bloodstream which may manifest as hyperthyroid like symptoms. During these episodes, your free thyroid hormones will be elevated and your TSH will drop. 

Overt Hypothyroidism

Over time, if not treated, most patients will eventually develop symptoms of hypothyroidism. 

As antibodies remain elevated (and untreated) in the blood for long periods of time, thyroid glandular damage (4) will accumulate.

Once this point reaches critical mass you will eventually lose endogenous production of thyroid hormone.

This is usually the point where your symptoms progress and continue to worsen all of a sudden over a 1-2 year period.

Once patients get to this stage they may ultimately require life long use of thyroid hormone replacement due to this glandular damage.

The symptoms experienced at this stage generally mimic hypothyroidism but many patients still have lingering "general and diffuse" symptoms from the autoimmune component.

Hypothyroid symptoms due to glandular damage in Hashimoto's patients:

  • Extreme fatigue and/or exhaustion
  • Moderate weight gain (20-30+ pounds usually gained over a 6-12 month period)
  • Hair loss, hair thinning and/or hair breakage
  • Changes to mood, usually on the depression spectrum
  • Menstrual irregularities and other conditions like PMS/PMDD
  • Chronic and debilitating muscular and/or joint pain
  • Chronic and daily constipation, development of other GI issues like gas/bloating, acid reflux, low stomach acid, and SIBO/SIFO
  • + any other other generalized symptoms above
  • Bottom line: Once damage has accumulated the thyroid may become permanently damaged leading to reliance upon thyroid hormone replacement. These symptoms generally match symptoms of hypothyroidism from other causes. 

Symptoms of Hashimoto's Flareup

At some point in time, you may also experience what I refer to as a Hashimoto's 

These flare-ups usually result from some sort of "trigger".

We've already discussed how the immune system and inflammatory cascade in your body are dysregulated when you have Hashimoto's or autoimmune thyroiditis in a previous section but what we didn't talk about is how sensitive the immune system really is.

Due to these problems, your immune system is hyperexcitable.

Meaning that small changes may result in a cascade effect causing multiple downstream effects.

This cascade is usually responsible for the symptoms of a "flare-up".

Symptoms of a Hashimoto's flare-up include:

  • Abrupt worsening of fatigue
  • Usually weight gain from an unclear source without changing your diet or food intake (rarely some patients do experience some weight loss)
  • General feeling of weakness or malaise
  • Abrupt worsening of joint pain/muscular pain
  • Racing heart, jittery sensation or feeling an uncomfortable "rush"
  • Abrupt onset of brain fog, difficulty concentrating or inability to focus on difficult tasks
  • Changes to GI function
  • Some patients may experience acute symptoms of Hyperthyroidism (see list above)
  • Some patients may experience acute symptoms of Hypothyroidism (see list above)

While flare-ups may differ dramatically from person to person, it's important not to focus on the symptoms necessarily but instead what they mean for your body. 

During a "flareup" both your immune system and inflammatory system have been triggered and you may be damaging your thyroid.

It's important to find the eliminate the cause of whatever triggered this event.

Manage flare-up by managing inflammation and finding the source

Since finding the source of the flare-up is so critical I've included several possible factors that can all influence Hashimoto's symptoms and trigger a "flareup". 

List of Hashimoto's flare-up sources:

Endocrine disruptors on thyroid function

You will notice that many of these sources of flare-ups can also be potential triggers of the autoimmune disease itself. 

This makes sense because you can trigger Hashimoto's with emotional stress and then make the disease worse by introducing another trigger/flare up source. 

For these reasons I always recommend that patients take a comprehensive approach to managing their Hashimoto's to eliminate increased risk for making their disease worse.

If you focus on and treat multiple problems at once then your results will be better and you will have less risk for a flare-up. 

You can find information on how to reduce your antibody levels here, and you can find more information on how to manage other triggers of Hashimoto's in this post.

Recap + Final thoughts

Hashimoto's disease should be differentiated from other causes of hypothyroidism because of the inflammatory and autoimmune component that accompanies it. 

Addressing both of these components are required for optimal treatment.

On the other hand, the symptoms of Hashimoto's tend to differ drastically from other causes of hypothyroidism from these components as well.

This results in various symptoms ranging from diffuse and generalized symptoms to "flushes" of thyroid hormone causing hyperthyroidism and ultimately hypothyroidism if the disease progresses enough.

Some patients will also experience flares throughout the course of their disease which can be managed by eliminating the source.

Now it's your turn:

Do you have Hashimoto's or autoimmune thyroiditis?

Do your symptoms follow the "textbook"?

Have you experienced a flare before? If so what were your symptoms?

Leave your comments below!

References (Click to Expand)

hashimoto's flare up symptoms and triggers

Dr. Westin Childs

About Dr. Westin Childs

Hey! I'm Westin Childs D.O. (former Osteopathic Physician). I don't practice medicine anymore and instead specialize in helping people like YOU who have thyroid problems, hormone imbalances, and weight loss resistance. I love to write and share what I've learned over the years. I also happen to formulate the best supplements on the market (well, at least in my opinion!) and I'm proud to say that over 45,000+ people have used them over the last 4.5 years. You can read more about my own personal health journey and why I am so passionate about what I do here.

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