<s>[INST] Hi, i am 22 year old female. I just had viral infection. Urinary tract and chest infection. Both infection are cleared now but i have lost weight but i do have apetite. I still feel tired and have on and off high pulse rate. It has come down from 125 to between 70-90. My thyroid is being checked. Do i need to be concerned? i need to gain 15 kg im 40kg and am 5ft 2 small frame. [/INST] Hello. Thanks for writing to Chat Doctor. I read and understand your question very well. I try my best to help you. As you have just recover from viral infection. It happens to decrease appetite after infection. It is also had weakness and high pulse rate after infection. So don't worry about this. Just diver your thoughts out of these things. Do what ever you like, you enjoy , just diver your thoughts. Keep yourself busy by doing things. All thing return to normal after few days. Try to take food, fruits that you like. I hope my advice will help you a lot. Thanks and Regards. Chat Doctor.  </s>