Unintentional weight loss is also referred to as involuntary or unintended weight loss;
There are many causes of unintentional weight loss,
1, medical or psychiatric factors
Malignancy
Nonmalignant gastrointestinal diseases
Psychiatric disorders
Endocrinopathies
Infectious diseases
Advanced chronic disease
Neurologic diseases
Medications/substances
Rheumatologic
。。。。。
2,
Social factors leading to inadequate dietary intake – eg. weight loss from inadequate dietary intake due to social factors (eg, inability to obtain food)； 這可能呢還是可能呢？ 
3,
Exercises – maybe 欲嫂require you to be lean or lose weight
4, 此處省略
some tests, possibly you need：
1, Complete blood count with differential (anemia in adults，neutrophilia and unexplained eosinophilia)
2, Electrolytes (hypotonic hyponatremia, hypernatremia, and hyperkalemia or hypokalemia) (Calcium hypercalcemia or hypocalcemia)
3, Glucose and hemoglobin A1c
4, Renal function and urinalysis
5, Hepatic function (abnormal liver biochemical and function tests)
6, Thyroid-stimulating hormone (thyroid function)
7, Stool Hemoccult (Evaluation of occult gastrointestinal bleeding)
8, Erythrocyte sedimentation rate (ESR) or C-reactive protein (CRP)
9, Human immunodeficiency virus (HIV)
10, Hepatitis C in patients with risk factors
11, Chest radiograph (for tuberculosis or malignancy)
12, Age-appropriate cancer screening
哈哈，別嚇欲哥了。沒有任何異常signs or symptoms, 欲哥不要自己嚇自己。
千金難買中年瘦。
