Unexplained weight gain can be frustrating and concerning. There are many potential causes, both medical and lifestyle-related. Common medical causes include:
- Hypothyroidism: When the thyroid gland is underactive, it slows metabolism making weight loss difficult. Symptoms include fatigue, cold sensitivity, and muscle weakness.
 - Cushing's syndrome: Excess cortisol leads to central obesity, moon face, and buffalo hump. It may be caused by tumors or medication side effects.
 - Polycystic ovary syndrome (PCOS): A hormonal imbalance that causes irregular periods, acne, excess hair growth, and often weight gain focused around the belly.
 - Depression and anxiety: Stress hormones stimulate appetite and fat storage around the midsection. Emotional health affects weight significantly.
 
- Diet: An increase in sugary, fatty, and processed foods packs on pounds rapidly. Pay attention to your current eating patterns.
 - Activity level: Sedentary routines with low activity expend less energy. Metabolism naturally slows when exercising less.
 - Sleep: Lack of sleep is linked to increased hunger hormones and sugar cravings the next day.
 - Medications: Many prescriptions list weight gain as a common side effect.