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Hormones
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Endocrine System

Hormones

Hormones act as the body's chemical messengers, traveling through the bloodstream to regulate critical processes such as growth, metabolism, and reproduction.

Overview

Hormones are powerful substances that work slowly over time to influence nearly every aspect of your health. Even a tiny amount can trigger significant changes in cells or the entire body, making the balance of hormone levels essential for health.

Key Functions

Hormones regulate several vital bodily processes, including:

  • Growth and development
  • Metabolism (how the body converts food into energy)
  • Sexual function
  • Reproduction
  • Mood

Production

Hormones are produced by endocrine glands, which are specialized groups of cells. Major glands include:

  • Pituitary gland
  • Pineal gland
  • Thymus
  • Thyroid
  • Adrenal glands
  • Pancreas
  • Testes (in men)
  • Ovaries (in women)

Testing

Because hormone levels must be precise, an excess or deficiency can lead to serious health issues. Healthcare providers may use laboratory tests to measure hormone levels in blood, urine, or saliva if a hormone disorder is suspected. Common examples include diagnostic blood work and home pregnancy tests, which detect specific pregnancy hormones in the urine.

Frequently Asked Questions

They start with a detailed history and physical exam, then order specific blood or urine tests for hormones relevant to the symptoms (e.g., thyroid hormones for fatigue, cortisol for stress‑related issues). The pattern of results—high, low, or normal—helps pinpoint which gland or hormone is out of balance.
The standard panel includes TSH, free T4, and sometimes free T3. A high TSH with low free T4 suggests primary hypothyroidism; a low TSH with high free T4 indicates hyperthyroidism. Normal values vary by lab, but these tests guide whether medication, surgery, or observation is needed.
Regular exercise, balanced nutrition, adequate sleep, and stress‑management techniques (yoga, meditation) all influence hormone production and sensitivity. For example, consistent moderate exercise can improve insulin sensitivity, while a diet rich in omega‑3 fatty acids supports healthy thyroid function. Avoiding excessive caffeine and alcohol also helps keep cortisol and estrogen levels in check.
Hormone replacement (e.g., estrogen, testosterone, thyroid hormone) can alleviate symptoms but carries risks such as blood clots, cardiovascular events, or cancer recurrence in hormone‑sensitive tissues. Therapy should be individualized, monitored regularly, and adjusted based on symptom relief and lab values.===
Source: MedlinePlus, National Library of Medicine

MedlinePlus brings together authoritative health information from the National Library of Medicine (NLM), the National Institutes of Health (NIH), and other government agencies and health-related organizations.

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