I am 26 year old male, my problem is I am really underweight. I have as really thin from childhood days I have tried many things like going to gym taking weigh protein, consulting different doctors nothing is working. My height is 5.9 and I weight is 38. I don't have any other health issues I rarely get sick. My only problem in my life is underweight. I am vegetarian by birth and I am bit picky eater. Can you please suggest me anything which gives me more appetite and gain weight. Also I have one question is there any diseases where you will be underweight no matter what you do unless you get treatment for that particular disease. Cause I am trying my best to increase weight no matter what I try. Nothing is working. It may also be in my gums cause my parents was also really thin at my age and they become fat latter.