<s>[INST] I have been having some tingling only on my left chest for months. Awhile ago, I was lightheaded for a couple days straight. Now I have some tingling in my stomach to go along with the chest tightness and tingling. Any ideas of what is causing these symptoms? [/INST] Hi, Without an examination and some appropriate testing, your symptoms are nonspecific at this point to give you any type of rock-solid diagnosis. Of course, there's the easy go to the diagnosis of nervousness and anxiety which you may have already heard either from friends, coworkers, or even you talking to yourself.  However, there are organic reasons for the feelings of tingling and sensations of tightness. Anything from side effects of medications to low serum levels of vitamin B12, folate, B6, or It. D. And then, there are probably less likely things for these symptoms as thyroid hormones that are somehow either too high or too low. And then, there are the often overlooked causes of such general and nonspecific symptoms such as medication side effects or medication interactions.  Again, only a good history, examination, and appropriate testing will point you in a specific direction. See your doctor and see what comes as a suggestion. Hope I have answered your query. Let me know if I can assist you further.  </s>