Never play with calf muscle pain. Seek medical help. If you have persistent elbow pain, take a break from tennis for a few weeks. Icing can also help. If the pain continues, see a physician, who may prescribe an elbow strap, strengthening exercises, and other measures.
Tennis toe is characterized by severe, throbbing pain beneath the toenail.
Symptoms include vague swelling of the toe and purple discoloration under the nail. The discoloration is from bleeding, which may appear as vertical streaks beneath the nail. The condition usually affects the big toe or the one next to it. Tennis toe is often caused by modern tennis shoes, which give such good traction that the foot is forced to the front of the shoe during sudden stops, thus traumatizing the nail. Shoes should have a finger's width of room in front of the toes.