instruction: hello doctor for about two weeks now I have had a twitch in my left arm triceps that seems to be worse when I have my arm straight and down by the side of my body and less noticeable when I have my arm over my head and bent at the elbow the twitch seems to be worse at times without any particular reason for it this night I had difficulty sleeping because it was very annoying I used to do some resistance training before this so it might be some type of nerve injury but I have not experienced any pain or discomfort during exercising before the twitch began also I have stopped training ever since discovering the twitch I am starting to worry that this might be some type of motor neuron disease as it is not going away and it is not improving at all I cannot visit a doctor earlier than monday so any advice or explanation of what this could be would be greatly appreciated
output: hi this is acute onset localized twitches started after strenuous activity this seems to be physiological twitches that are occurring due to minor muscle or nerve injury just check for any weakness or loss of muscle mass in the region where you are developing twitches if they are not then no need to worry excess consumption of coffee and smoking can cause the same so avoid excessive coffee and smoking if any is there this is unlikely to be motor neuron disease and at this age and will have prolonged course sometimes they are unnoticed completely