The thyroid is a butterfly-shaped endocrine gland located below the Adam’s apple in the lower part of the neck that wraps around the windpipe (trachea).
The thyroid plays a role in a number of bodily functions, including:
- Metabolism of fats, carbohydrates, proteins, electrolytes, and water
- Metabolic rate (oxygen consumption)
- Growth and development
- Resistance to infection
- Vitamin requirements
- Reproduction
- Playing a role in metabolic rate
- Maintaining bone health
- Maintaining muscle control
- Preserving brain function and development
- Maintaining heart and digestive functions
Hypothyroidism (underactive thyroid) occurs when a person produces insufficient amounts of thyroid hormone. The opposite of hypothyroidism is hyperthyroidism (also called overactive thyroid), a condition in which the body produces too much thyroid hormone and increases the body’s metabolism.
Early signs of thyroid problems include:
- Gastrointestinal problems
- Diarrhea (hyperthyroidism)
- Constipation (hypothyroidism)
- Mood changes
- Anger, anxiety (hyperthyroidism)
- Depression (hypothyroidism)
- Weight changes
- Weight loss (hyperthyroidism)
- Weight gain (hypothyroidism)
- Skin problems
- Sensitivity to temperature changes
- Difficulty in hot weather, sweating when it’s not excessively hot, hot flashes (hyperthyroidism)
- Difficulty in cold weather, needing to wear extra layers inside, cold feet and hands (hypothyroidism)
- Vision changes (occurs more often with hyperthyroidism)
- Watery eyes
- Eye redness or dryness
- Difficulty closing the eyelids
- Bulging eyes
- Hair thinning or hair loss (hyperthyroidism)
- Memory problems (both hyperthyroidism and hypothyroidism)
- Lumps or nodules on the neck
- May be a sign of thyroid cancer
- See a doctor if you notice a lump on the neck
What Are Symptons of Hypothyroidism?
Common symptoms of hypothyroidism (underactive thyroid) may include:
- Fatigue/lethargy
- Loss of energy
- Weight gain
- Weakness in extremities
- Decreased appetite
- Constipation
- Sleepiness
- Muscle pain
- Joint pain
- Dry skin
- Hair loss
- Mood swings
- Depression
- Mental impairment
- Cold intolerance
- Impaired memory/forgetfulness
- Mental impairment
- Difficulty concentrating
- Fertility problems
- Menstrual disturbances
- Decreased sweating
- Numbness and tingling and nerve entrapment syndromes
- Decreased hearing
- Mood swings
- The feeling of fullness in the throat
- Hoarseness
- Nail problems
What Are Symptoms of Hyperthyroidism?
Hyperthyroidism (overactive thyroid) may not cause any symptoms. When symptoms of hyperthyroidism occur, they may include:
- Anxiety
- Irritability
- Trouble sleeping
- Sweating more than usual
- Heat intolerance
- Weakness
- Hand tremors
- Fast or uneven heartbeats
- Tiredness/fatigue
- Weight loss even with a normal or increased appetite
- Frequent bowel movements
- Bulging eyes (if hyperthyroidism is caused by Graves' disease)
- Swelling in the neck (goiter)
- Irregular or missed menstrual periods, which may be associated with infertility
- Breast tissue growth in men
- Erectile dysfunction (impotence)
- Atrial fibrillation, chest pain, and rarely, heart failure if untreated
From
https://www.uptodate.com/contents/hypothyroidism-underactive-thyroid-the-basics?search=Hypothyroidism&source=search_result&selectedTitle=1~150&usage_type=default&display_rank=1
https://www.uptodate.com/contents/hyperthyroidism-overactive-thyroid-beyond-the-basics?search=Hyperthyroidism&topicRef=15437&source=see_link
https://medicaltransformationcenter.com/what-are-early-warning-signs-of-thyroid-problems/