November 30, 2022 - Understand what happens when your thyroid is overactive and learn about treatment for this condition.

Read about the symptoms of an overactive thyroid (hyperthyroidism), which include anxiety, hyperactivity and feeling tired all the time.

September 11, 2025 - Hyperthyroidism, also called overactive thyroid, happens when your thyroid makes and releases high levels of thyroid hormone. It speeds up several bodily functions, causing symptoms like rapid heart rate, weight loss, increased appetite and anxiety.

April 29, 2022 - Difficulty sleeping: While we don't yet understand why, hyperthyroidism can cause sleep disturbance.⁵ You might take longer to fall asleep, have difficulty staying asleep, and be sleepy during the day. Other symptoms, such as hand tremors, may be bad enough to wake you up.

July 28, 2023 - There is a milder form of hyperthyroidism called “subclinical hyperthyroidism”. In Subclinical hyperthyroidism, the TSH is low but the T4 and T3 are normal. Some people may have symptoms from subclinical hyperthyroidism, but many people will not have any symptoms at all.

1 week ago - Hyperthyroidism develops when your body has too much thyroid hormone. Your thyroid gland, located at the base of your neck, produces hormones that control how the cells in your body use energy. When your thyroid is overactive, you may experience weight loss, changes in your heart rate, nervousness, and other symptoms.

October 7, 2025 - In older adults, hyperthyroidism is sometimes mistaken for depression or dementia. Older adults may have different symptoms, such as loss of appetite or withdrawal from people, than younger adults with hyperthyroidism.

Adults over age 60 may have different symptoms than younger adults. For example, they may lose their appetite or withdraw from other people. Sometimes this can be mistaken for depression or dementia. If hyperthyroidism isn't treated, it can cause some serious health problems, including:

December 3, 2025 - These include fast heartbeat and symptoms of palpitations, nervous system tremor such as of the hands and anxiety symptoms, digestive system hypermotility, unintended weight loss, and, in lipid panel blood tests, a lower and sometimes unusually low serum cholesterol. Major clinical signs of hyperthyroidism include weight loss (often accompanied by an increased appetite), anxiety, heat intolerance, hair loss, muscle aches, weakness, fatigue, hyperactivity, irritability, high blood sugar, excessive urination, excessive thirst, delirium, tremor, pretibial myxedema (in Graves' disease), emotional lability, and sweating.

March 26, 2025 - If you have hyperthyroidism, you may have some of the following physical signs: a swelling in your neck caused by an enlarged thyroid gland (goitre) irregular and/or unusually fast heart rate (palpitations) ...

This is a rare, but life-threatening condition. It can occur when hyperthyroidism goes untreated or under-treated. Symptoms of a thyroid storm include high fever, fast heart rate, dehydration, confusion/agitation and diarrhea.

Menstrual irregularity. A thyroid problem (whether underactive or overactive) often wreaks havoc on menstruation. With hyperthyroidism, a woman’s cycle may be shorter and lighter than normal.

This is because most people who are treated for hyperthyroidism eventually develop hypothyroidism.The treatment causes the thyroid to become underactive. The symptoms include lethargy, unexpected weight gain, constipation and sensitivity to the cold.

The thyroid gland quickly absorbs the RAI from the bloodstream and, within a few months, the gland shrinks and symptoms slowly disappear. Surgery to remove most of the thyroid gland is called a thyroidectomy. It's done in a hospital under general anesthesia, so the person is asleep and feels nothing. A small incision (cut) in the lower central part of the neck usually leaves a thin scar. It's common to have some pain for a few days after the surgery, but most people feel much better within a few days. After treatment for hyperthyroidism, hormone production often slows down to hypothyroid (underactive) levels.

July 18, 2025 - Using eye drops and wearing sunglasses can help relieve symptoms. In severe cases, certain drugs, such as steroids or immunosuppressive drugs, can decrease the swelling behind the eyes. A thyroid storm is an uncommon reaction that can occur after an infection, injury, or physical trauma, such as surgery or childbirth. It can also occur in pregnancy if the person has undiagnosed hyperthyroidism or difficulties in controlling the condition.

Thyroid hormone has important effect ... symptoms from any of these organs. Excess thyroid hormone increases metabolism and can cause weight loss, sweating, and a rapid heartbeat....

July 29, 2025 - Hyperthyroidism accelerates your body’s metabolism. It is difficult to diagnose as the signs and symptoms are similar to other conditions. Download a tick-box version of hyperthyroid signs and symptoms Compare hypothyroid and hyperthyroid signs and symptoms.

October 17, 2025 - In rare cases, the cause could be a benign (noncancerous) tumor on the pituitary gland. Contact your doctor if you have symptoms of an overactive thyroid. He or she will check for an enlarged thyroid gland, rapid pulse, moist skin, eye changes, and a slight tremor in your fingers or hand.

April 11, 2024 - When you first get hyperthyroidism, you may feel energetic. This is because your metabolism is sped up. But over time, this increase in your metabolism can break your body down and make you feel tired. If you’re an older adult, you’re more likely to have subtle symptoms such as a faster heart rate or being more sensitive to warm temperatures.