Both hypothyroidism and hyperthyroidism may contribute to changes in menstrual patterns.
This is one reason thyroid health deserves particular attention in women who experience persistent menstrual irregularities or difficulty becoming pregnant.
How hypothyroidism can affect menstruation
An underactive thyroid may contribute to heavier, longer, or irregular menstrual periods.
In some cases, it can interfere with ovulation and make conception more difficult.
Hypothyroidism can also affect prolactin levels, a hormone involved in lactation that can influence reproductive function when elevated.
However, menstrual changes can have many other causes, including pregnancy, polycystic ovary syndrome, uterine fibroids, perimenopause, and other hormonal conditions.
How hyperthyroidism can affect menstruation
An overactive thyroid may cause lighter, less frequent, or irregular periods.
Some women experience changes in cycle length or reduced menstrual flow.
If thyroid dysfunction is significant, it can affect reproductive health and may complicate pregnancy planning.
Why pregnancy makes thyroid assessment important
Pregnancy increases the body's thyroid hormone requirements and changes the interpretation of certain thyroid tests.
Untreated significant thyroid dysfunction during pregnancy can increase the risk of complications for both the pregnant person and the developing baby.
Women with known thyroid disease who are planning pregnancy or who become pregnant should contact their healthcare professional promptly to review their treatment and monitoring needs.
Thyroid medication requirements may change during pregnancy, and laboratory monitoring is important.
Do not stop thyroid medication because of pregnancy without medical advice.
6. A Swelling or Lump in the Neck
The thyroid gland sits at the front of the neck, below the voice box and around the upper portion of the windpipe.
When the gland enlarges, the swelling may become visible or noticeable when swallowing.
An enlarged thyroid is called a goiter.
Goiter can develop for several reasons, including iodine deficiency, autoimmune thyroid disease, thyroid nodules, and other conditions.
Importantly, an enlarged thyroid does not automatically mean that thyroid hormone levels are abnormal.
Some people have an enlarged gland while producing normal amounts of hormone. Others have enlargement associated with hypothyroidism or hyperthyroidism.
What might a thyroid lump mean?
Thyroid nodules are relatively common, and most are benign.
However, some nodules require further evaluation to determine their nature.
A clinician may examine the neck, order thyroid blood tests, and recommend an ultrasound.
Depending on the ultrasound findings, a fine-needle aspiration biopsy may be recommended. This procedure collects cells from a nodule so they can be examined.
Not every thyroid nodule requires biopsy or surgery. Decisions depend on its size, ultrasound characteristics, growth pattern, and other risk factors.
When should neck swelling be checked?
Seek medical evaluation if you notice a new lump or swelling at the front of your neck, especially if it persists or grows.
Difficulty swallowing, persistent hoarseness, or a sensation of pressure in the neck also deserves assessment.
Rapidly increasing swelling or difficulty breathing requires urgent medical attention.
A neck lump should not be treated with unverified supplements or home remedies before its cause has been established.
7. Rapid Heartbeat, Palpitations, or Tremors
A racing heartbeat is one of the more recognizable symptoms of hyperthyroidism.
Excess thyroid hormone increases the body's sensitivity to certain stimulatory signals and can increase heart rate.
Some people notice that their heart seems to pound, flutter, or beat irregularly even when they are resting.
Fine hand tremors may also occur, making it difficult to hold a cup steadily or perform tasks requiring precise movements.
These symptoms can be accompanied by sweating, anxiety, heat intolerance, and sleep disturbances.
Why does thyroid hormone affect the heart?
Thyroid hormones influence the cardiovascular system, including heart rate, cardiac output, and the response to adrenaline-like signals.
When hormone levels are too high, the heart may work harder than necessary.
Untreated hyperthyroidism can increase the risk of atrial fibrillation, an abnormal heart rhythm that may raise the risk of stroke.
In severe cases, excessive thyroid hormone can contribute to heart failure or other serious complications, particularly in people with underlying heart disease.
Could palpitations have another cause?
Yes. Palpitations may occur because of anxiety, caffeine, dehydration, certain medications, anemia, or an independent heart rhythm disorder.
A rapid heartbeat should not automatically be attributed to thyroid disease.
A healthcare professional may evaluate the pulse, order thyroid tests, and perform an electrocardiogram or other investigations when indicated.
Seek emergency care if a rapid or irregular heartbeat occurs with chest pain, fainting, severe shortness of breath, or significant dizziness.