Hormone imbalance refers to abnormal levels of one or more hormones in the bloodstream, disrupting the body’s regulatory systems that control metabolism, growth, reproduction, mood, and other vital functions. Hormones are produced by endocrine glands such as the thyroid, adrenal glands, pancreas, and reproductive organs, and even small fluctuations can have significant effects. Symptoms vary depending on the hormone involved but may include fatigue, weight changes, mood swings, irregular menstrual cycles, infertility, sleep disturbances, hair thinning, or changes in blood sugar levels. Causes can include thyroid disorders, polycystic ovary syndrome (PCOS), diabetes, chronic stress, aging, or endocrine gland dysfunction. Because hormones influence many body systems, persistent or unexplained symptoms warrant medical evaluation to determine the underlying cause.