<s>[INST] Sometimes when i bend down (point towards my toes/ to pick something up) theres  a sense of pressure and pain at my sternum. Sometimes when i get up from the couch as well. May i know what is the cause of this? im skinny as well,weighing at 42kg,and 158cm. Could this be the cause of it?  Because my chest is almost a little flat? Thanks for answering m question :) i appreciate it. [/INST] Thanks for your question on Chat Doctor. I can understand your concern By your history and description, possibility of musculoskeletal pain is more. Pain with movements is classical finding in musculoskeletal pain. So better to avoid heavyweight lifting and strenuous exercise. Avoid movements causing pain. Avoid bad postures in sleep. Start painkiller and muscle relaxant Chat Doctor.  Apply warm water pad on affected areas. Don't worry, you will be alright. Hope I have solved your query. Wish you good health. Thanks. </s>