Could Your Fatigue, Weight Gain, or Brain Fog Be Hypothyroidism?
Hypothyroidism, also called an underactive thyroid, happens when the thyroid gland does not make enough thyroid hormone for the body’s needs. Because thyroid hormone helps regulate energy use throughout the body, low thyroid levels can affect energy, weight, mood, digestion, skin, hair, heart rate, menstrual cycles, and temperature tolerance.
Hypothyroidism can develop slowly, and symptoms may be easy to miss or mistake for stress, aging, poor sleep, depression, menopause, or a busy lifestyle. A medical evaluation can help determine whether thyroid testing is appropriate.
What is hypothyroidism?
The thyroid is a small butterfly-shaped gland in the front of the neck. It makes hormones that help regulate metabolism, energy, body temperature, heart function, digestion, and many other body processes.
When thyroid hormone levels are too low, body functions may slow down. This can lead to symptoms such as fatigue, cold intolerance, constipation, dry skin, weight changes, and low mood.
Common causes
Common causes or contributing factors may include:
Hashimoto’s thyroiditis, an autoimmune thyroid condition
Family history of thyroid disease
Prior thyroid surgery
Prior radioactive iodine treatment
Radiation exposure to the neck
Certain medications
Iodine imbalance
Pregnancy or postpartum thyroid changes
Pituitary gland disorders, less commonly
Other autoimmune conditions
Hashimoto’s thyroiditis is one of the most common causes of hypothyroidism in the United States.
Common symptoms
Hypothyroidism symptoms may include:
Fatigue
Weight gain or difficulty losing weight
Feeling cold when others are comfortable
Constipation
Dry skin
Hair thinning or hair loss
Brittle nails
Puffy face
Hoarse voice
Muscle aches or weakness
Joint pain or stiffness
Low mood or depression symptoms
Brain fog or forgetfulness
Slower heart rate
Heavy or irregular menstrual periods
Fertility concerns
Elevated cholesterol
Low energy or reduced exercise tolerance
Not everyone has all symptoms. Some people have mild symptoms or no obvious symptoms, especially early on.
Risk factors
Hypothyroidism may be more likely in people who have:
Family history of thyroid disease
Autoimmune disease, such as type 1 diabetes or celiac disease
History of thyroid surgery
Prior radiation to the head or neck
Prior radioactive iodine treatment
Pregnancy or recent childbirth
Age over 60
Certain medication exposure
Known thyroid antibodies
History of abnormal thyroid labs
Women are diagnosed with hypothyroidism more often than men, but anyone can develop it.
When to seek medical care
Schedule a medical evaluation if you have:
Persistent fatigue
Unexplained weight gain
Difficulty losing weight despite consistent effort
Feeling unusually cold
Constipation that is persistent or worsening
Hair thinning or hair loss
Dry skin with other thyroid-type symptoms
Heavy, irregular, or changing periods
Fertility concerns
Depression symptoms or brain fog
Elevated cholesterol
Family history of thyroid disease
History of thyroid disease or abnormal thyroid labs
New symptoms after pregnancy
Neck swelling, thyroid enlargement, or a lump in the neck
Thyroid symptoms can overlap with anemia, vitamin deficiencies, diabetes, depression, sleep apnea, menopause, medication side effects, and other medical concerns, so evaluation is important.
When to seek urgent or emergency care
Seek urgent or emergency care for:
Severe weakness
Confusion
Fainting
Chest pain
Trouble breathing
Very slow heart rate with symptoms
Low body temperature
Severe swelling
Severe allergic reaction symptoms
Rapidly worsening symptoms
Thoughts of self-harm or suicide
Call or text 988 for mental health crisis support. Call 911 for a medical emergency.
Can telehealth help?
Yes. Telehealth may help review symptoms, medical history, family history, medications, weight changes, menstrual changes, mood symptoms, and whether thyroid-related labs may be appropriate.
Telehealth may also help review thyroid lab results and discuss whether follow-up, repeat testing, medication review, or in-person evaluation may be needed.
In-person care may be needed for a neck lump, significant thyroid enlargement, severe symptoms, pregnancy-related concerns, abnormal exam findings, or symptoms that suggest an urgent condition.
Prevention and follow-up
General prevention and follow-up considerations include:
Following up on abnormal thyroid labs
Reviewing thyroid symptoms when fatigue, weight changes, mood changes, or menstrual changes occur
Keeping a personal record of thyroid results if you have known thyroid disease
Reviewing medication and supplement use with a healthcare professional
Avoiding unregulated thyroid supplements without medical guidance
Monitoring thyroid levels during pregnancy or postpartum when indicated
Keeping follow-up appointments if thyroid medication is prescribed
Reporting symptoms that suggest over-treatment or under-treatment
Thyroid hormone levels can change over time, so follow-up testing and monitoring may be needed when thyroid disease is suspected or diagnosed.
Final thought
Hypothyroidism can cause fatigue, weight changes, cold intolerance, constipation, dry skin, hair thinning, mood changes, and brain fog, but these symptoms can also have other causes. A medical evaluation and appropriate lab testing can help clarify whether the thyroid may be part of the problem.
This information is for educational purposes only and does not replace medical advice, diagnosis, or treatment. If you are experiencing severe symptoms, signs of infection, severe allergic reaction symptoms, trouble breathing, or a medical emergency, call 911 or go to the nearest emergency room.
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