Chronic fatigue, unexplained weight loss or gain, infertility, and hair loss can all signal a hormonal imbalance. You might consider a hormone test if you’re experiencing these or more. Hormone tests ...

Psychology Today's online self-tests are intended for informational purposes only and are not diagnostic tools. Psychology Today does not capture or store personally identifiable information, and your ...

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Immunoglobulins (antibodies) are Y-shaped proteins made by plasma cells that help fight infection. They neutralize invaders, tag them for macrophages, and trigger other immune responses. Each antibody ...