Somatic, also known as physical, symptoms of stress include aches, pains, tense muscles, headaches and insomnia, according to WebMD. An upset stomach is also common, and it can cause constipation, nausea or diarrhea.
Physical symptoms of stress also include reduced energy levels, frequent colds and infections, a loss of sexual desire or sexual ability, and nervousness and shaking, explains WebMD. Some patients experiencing stress have rapid heartbeats, chest pain, dry mouth and difficulty swallowing, and they clench their jaws and grind their teeth. The onset of stress can cause cold or sweaty feet and hands and ringing in the ear.