Im 18 years old, I weight 318 pounds im 5.9, and Im not really alergic to anything and except from being over my normal weight of 220, Im quite healthy. I Have never had any type of chest pains, this just came out of no where after sex. After I had sex i had went to the washroom to urinate and as soon as I sat down I began to feel a slight jabbing feeling in my left chest area, this pain continued although it was not severe because it only hurt when I took a breath. I tried everything to make it go away, it was uncomfortable. Ive never had this happen to me, recently Ive lost a bit of weight and I think its due to the way I have been eating. Im usually so busy during the day with meetings and such, I only usually have time to consume a minimum of 1500 calories a day but its usually all at one serving. Could i have any case of malnutrition or lack of potassium in my muslces which is causing the pain? I dont know whats up Wondering what you think...