Tightening in a mans stomach may be caused from a stomach flu. It could also be due to muscle spasms. If they hurt, see a doctor.
Dehydration causes stomach cramps and in most cases headaches. (these symptoms go for men & women of all ages)
Anxiety
Decrease
my stomach is boiling what are the causes?
Practice contractions. The tightening of your stomach muscles and uterus preparing you for active labor
Yes, it is common for the stomach to feel hard during pregnancy due to the growing uterus and the muscles tightening.
Causes it to give a note of higher frequency
Over tightening the drain plug.
diagram of acid and alkali in stomach
Actually it is good, because tightening your stomach muscles strengthens them and supports your back, especially if you are lifting or moving something.
It depends on what stomach problem you have.
stomach flu.