Thyroid flare-ups, often in autoimmune conditions like Hashimoto's or Graves' disease, are triggered by stressors like infections, chronic stress, hormonal changes (pregnancy/menopause), poor nutrition (nutrient deficiencies or excess iodine), certain medications, physical trauma, and sudden stopping of thyroid meds, leading to shifts between underactive (hypo) and overactive (hyper) symptoms. These flares happen when the immune system attacks the thyroid or when the gland releases excess hormone due to sudden events, disrupting normal function.
For many people, a nutrient-dense, anti-inflammatory diet and consistent iodine intake help reduce triggers. Limiting added sugars and ultra-processed foods may also decrease the frequency and severity of flares.
You may feel fine one day, only to wake up the next feeling exhausted, foggy-headed, and unable to shake the cold creeping through your body. These fluctuations often signal a Hashimoto's flare-up—a period when the immune system attacks the thyroid, disrupting normal function and worsening symptoms.
An autoimmune flare-up can significantly affect your daily life and sometimes last for days on end.
Thyroiditis happens when the thyroid gland becomes inflamed, and its cells are damaged. This inflammation can have different causes depending on the type of thyroiditis. The most common cause is an autoimmune reaction, when the immune system mistakenly attacks the thyroid instead of protecting it.
A flare-up of an autoimmune condition like Hashimoto's can be triggered by various factors. These can include insufficient treatment of the condition, nutritional factors, inadequate sleep, stress, and exposure to certain chemicals, toxins, and infections.
How Can We Decrease Inflammation?
The most obvious symptom of subacute thyroiditis is pain in the neck caused by a swollen and inflamed thyroid gland. Sometimes, the pain can spread (radiate) to the jaw or ears. The thyroid gland may be painful and swollen for weeks or, in rare cases, months.
While the exact cause of a flare is not always clear, they often follow increased joint strain, changes in weather, or shifts in activity levels. Unlike the steady background discomfort many people with osteoarthritis experience, flare-ups represent an acute worsening of symptoms.
Symptoms of a thyroid storm include:
An overactive thyroid can affect anyone, but it's about 10 times more common in women than men, and typically happens between 20 and 40 years of age.
Cruciferous veggies
Particularly when raw. Eating a lot of raw cruciferous vegetables can keep your body from using iodine properly to make the thyroid hormone and stifle your thyroid's natural function. Members of the cruciferous family include: Dark, leafy greens (like chard, collard greens and kale).
The following foods are hard to digest or promote inflammation, which can worsen symptoms during a flare:
Diet
It is useful to identify how a flare up affects you personally. The earlier you can identify the signs the earlier you can take action to minimise its impact upon yourself. Common early warning signs are increased stiffness, poor quality of sleep, trouble concentrating or increased irritability.
What can I do during a flare up?
The length of a flare can depend on your overall health, the trigger causing the flare, and any medications you're taking. Flares can last hours, days, or even weeks. If a flare continues for several days and begins interfering with your daily activities, talk to your rheumatologist.
Thyroiditis generally isn't life-threatening. However, a life-threatening condition called thyroid storm can develop if you have long-term untreated or undertreated hyperthyroidism, which can develop from thyroiditis.
As you swallow, look at your neck. Check for any bulges or protrusions in this area when you swallow. Reminder: Don't confuse the Adam's apple with the thyroid gland. The thyroid gland is located further down on your neck, closer to the collarbone.
Increased perspiration caused by the condition can lead to night sweats, waking the patient during the night. While hypothyroidism is commonly associated with lethargy and a desire for sleep, studies have linked an underactive thyroid to poor sleep quality, shorter sleep duration, and longer sleep onset.
The position you sleep in directly affects pain, swelling, and healing of the neck. Recommended sleeping positions: On your back with head elevated: The safest and most comfortable position. Use 2–3 pillows or a wedge pillow to raise the head slightly.
Generally the thyroiditis resolves by itself within a few months, but sometimes it comes back or, more rarely, damages enough of the thyroid gland to cause permanent hypothyroidism. Aspirin or other nonsteroidal anti-inflammatory medications (NSAIDs) can relieve the pain and inflammation.
On the other hand, it is important to remember that some berries and citrus fruits like strawberries and peaches contain goitrogens. Since it can interfere with the thyroid glands' iodine uptake, eating these fruits of a larger quality can lead to hyperthyroidism.