what are the possible causes of weight loss?
['Muscle loss. Muscle loss, or muscle wasting, can lead to unexpected weight loss. ... ', 'Overactive thyroid. ... ', 'Rheumatoid arthritis. ... ', 'Diabetes. ... ', 'Depression. ... ', 'Inflammatory bowel disease. ... ', 'Chronic obstructive pulmonary disease. ... ', 'Endocarditis.']