What are the Symptoms of Hyperthyroidism?
Discover the symptoms and diagnosis methods for hyperthyroidism. Learn about its effects on metabolism, heart rate, physical and emotional health, and reproductive health. Early diagnosis is key to effective management.
Written by Dr Sonia Bhatt
Last updated on 3rd Jul, 2025
The thyroid gland produces two key hormones, triiodothyronine (T3) and thyroxine (T4). These hormones play a crucial role in regulating body temperature, energy level, metabolism, and heart function. Overproduction of these hormones leads to hyperthyroidism or an overactive thyroid, which can cause various health-related issues.
Understanding the symptoms of hyperthyroidism can help manage the condition effectively. Read on to learn about the hyperthyroidism symptoms, their implications, and diagnosis methods.
Common Symptoms of Hyperthyroidism
The common symptoms of hyperthyroidism include:
Nervousness and Anxiety
An overactive thyroid speeds up the metabolism of the body, overstimulating the entire nervous system. Hyperactivity of the nervous system leads to anxiety, sleeplessness, irritation, and other nervous system disorders in one’s body.
Increased Heart Rate
Thyroid overstimulation can cause multiple disturbances and disorders in the heart rhythm. One such disorder is sinus tachycardia. It is associated with an abnormal increase in the heart rate, which can be more than 100 bps (beats per minute).
Physical Effects of Hyperthyroidism
Hyperthyroidism also affects the physical aspect of one’s body, leading to the following symptoms:
Weight Loss
Unexplained weight loss is one of the common symptoms of hyperthyroidism. The increased metabolism due to the overproduction of hormones speeds up body functions. Normal metabolic activity stores energy by burning calories and creating tissue.
However, increased metabolic activity uses up the energy and destroys tissue due to higher levels of T3 and T4. Thus, one may experience weight loss despite an increase in appetite when diagnosed with hyperthyroidism.
Heat Intolerance
Over-secretion of thyroxine (T4) causes hyperthyroidism. As a result, the metabolism rate in a person increases, raising the body temperature.
Sweating
In hyperthyroidism, patients experience excessive sweating of the body, armpits, face, neck, and even palms. An overactive thyroid affects the ability of a body to regulate temperature. Thus, the person with hyperthyroidism experiences night sweats and sweating of all body parts due to poor heat regulation.
Muscular and Skeletal Symptoms of Hyperthyroidism
Hyperthyroidism also affects the skeletal and muscular features of a person, causing the following symptoms:
Tremors
In hyperthyroidism, the energy production in each body cell increases due to a high metabolic rate. This leads to excessive nervous stimuli that can cause tremors in the hand. The symptoms may include either unnoticeable shaking of the hand or over-shaking.
Muscle Weakness
Myopathy or muscle weakness in hyperthyroidism may occur due to a high level of muscular breakdown and overuse of greater muscle energy. As a result, one can experience muscle pain and weakness in various parts of the body, including the upper arm, shoulder, hip, etc.
Gastrointestinal Symptoms of Hyperthyroidism
Here are some of the hyperthyroidism symptoms of gastrointestinal issues:
Increased Appetite
Excessive hormone production increases the metabolic activity of a person diagnosed with hyperthyroidism. This causes the food to pass quickly through the digestive tract, causing quick digestion. As a result, a person feels hungry frequently.
Changes in Bowel Movements
Another effect of hypothyroidism is that it increases intestinal movements, manipulating a person to visit the lavatory frequently. The increase in bowel movements can lead to irritation of muscles and tissues around the rectum and anus. It can also cause complications like anal fistulas, rectal bleeding, or haemorrhoids.
Skin and Hair Changes in Hyperthyroidism
The effects of an overactive thyroid can even damage one’s skin and hair. Here are the symptoms to look for:
Thinning Hair
The hormonal imbalances in one’s body affect the hair follicles and disrupt the hair regrowth cycle. This can cause one’s hair to break or prone to thinning over time.
Skin Changes
Incorrect hormone levels in the body can cause skin thinning, warm and moist skin, and more changes. Once the skin gets thin, it can develop various diseases, rashes, and bruises.
Emotional and Cognitive Symptoms of Hyperthyroidism
The emotional symptoms of hyperthyroidism are as follows:
Mood Swings
In individuals with hyperthyroidism, mood swings are common due to abnormal hormone secretion. Patients may experience rapid shifts in mood that can be challenging to manage.
Fatigue
Despite feeling anxious or restless, many people with hyperthyroidism report fatigue. This occurs due to the body's increasing activities, which can be exhausting over time.
Hyperthyroidism Symptoms Specific to Women
Over-secretion of hormones affects the female reproductive organ, leading to the following symptoms:
Menstrual Irregularities
Women with hyperthyroidism often experience menstrual irregularities, including lighter periods or missed cycles. Such irregularities are caused by hormonal disruptions that affect reproductive health.
Fertility Issues
An overactive thyroid increases the prolactin levels in one’s body, preventing the ovum or egg from releasing and travelling through the fallopian tube and completing the fertilisation procedure. Thus, females face difficulty in conceiving.
Diagnosis of Hyperthyroidism
Healthcare providers follow the below diagnosis methods to determine hyperthyroidism:
Physical Examination
In physical assessment, healthcare providers check for symptoms such as goitre (enlarged thyroid) and signs of nervousness or tremors.
Blood Tests
For an effective diagnostic process, doctors suggest blood tests. They assess levels of thyroid hormones (T3 and T4) and thyroid-stimulating hormone (TSH). Low TSH levels and elevated T3 and T4 confirm hyperthyroidism.
Another method to diagnose hyperthyroidism is the imaging tests that include ultrasound, radioactive iodine uptake test (RAIU), and thyroid scan.
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Conclusion
Hyperthyroidism presents a range of symptoms that can significantly affect an individual's quality of life. Diagnosing the symptoms at an early stage is crucial for managing this thyroid disorder. It can also help prevent complications such as heart problems or osteoporosis through timely treatments.
Understanding hyperthyroidism is essential for anyone experiencing these symptoms or those who have a family history of thyroid disorders.
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