I lost a lot of weight without dieting. i have had blood tests done, and they were normal. what could cause weight loss without trying?

Weight Loss age 26: Your Health is Precious! Please see Physician for Possible Diagnosis of Depression, Alcohol dependence, Cocaine dependence , Hyperthyroidism, Diabetes, Peptic ulcer , Celiac disease, Crohn's disease , Ulcerative colitis, or Addison's disease. Have all necessary consultations, Lab and Radiological studies to establish Diagnosis for the needed Treatment.