*A condition that causes a lack of appetite, such as cancer, liver disease, persistent pain or nausea....
*A mental health condition, such as depression or schizophenia, which may affect your ability to look after yourself.
It would be a heat cramp because when you have heat cramps you have sharp cramps in your legs and have very moist flushed skin. You can also have a mild fever, usually less than 102 degrees F. Hope this Helps :P
If you aren't checking yourself then you may have a problem. For example you could have testicular cancer and you wouldn't know without feeling an unusual bump in that area.
Answer:
This is due to the property of contractility.