First things first, an underlying organic cause (disease) needs to be ruled out. The most common causes are usually either hyperthyroidism (overactive thyroid gland, and this is usually associated with weight loss despite good appetite, heat intolerance, nervousness, and an enlarged thyroid gland or goiter on physical examination), or intestinal malabsorption (poor absorption of nutrients in the intestines) especially if you have chronic loose stools - this latter condition may be the result of chronic inflammation of the intestinal walls.
So my advice to you is to seek medical attention to make sure you do not have any underlying organic cause that may be interfering with the weight gain process. Should all turn out to be normal, then you will have to consult both a nutritionist and a physical trainer, because you will need a rigorous program of intense workout and a high calorie diet (including drinking special high calorie milk shakes) to bulk up some muscles and maintain the added weight. I understand you mentioned that you did sports but you may be performing the wrong kind of sports. So this may take some time before you notice some changes in your body appearance, so always remember to be patient and perseverant.
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Annual Checkup
It is recommended that all individuals see a Family Doctor for a full medical examination annually. Adults should get their blood pressure checked (US Preventive Task Force), a flu vaccine (CDC) and more each year.
The American Dental Association recommends dental cleanings for adults at least twice annually. Some stains can only be removed by a professional cleaning.
It’s recommended by the American Academy of Ophthalmology that every adult between the ages of 18 and 80 does an eye examination at least once every two years.
It's recommended by the American Cancer Association that every adult between the age of 20 and 80 does an annual skin screening by a licensed dermatologist.
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