1 The lymph nodes in the groin (femoral or inguinal lymph nodes) may swell from an injury or infection in the foot, leg, groin, or genitals. 2  In rare cases, testicular cancer, lymphoma, or melanoma may cause a lump in this area. Glands can also swell following an injury, such as a cut or bite, near the gland or when a tumor or infection occurs in the mouth, head, or neck. 2  Glands in the armpit (axillary lymph nodes) may swell from an injury or infection to the arm or hand. 3  A rare cause of axillary swelling may be breast cancer or lymphoma.
Gastroenteritis, also known as infectious diarrhea, is inflammation of the gastrointestinal tract that involves the stomach and small intestine. Signs and symptoms include some combination of diarrhea, vomiting, and abdominal pain. Fever, lack of energy, and dehydration may also occur. This typically lasts less than two weeks.
The intestinal tract is no exception, so there is some evidence to suggest that diarrhea can be caused or exacerbated by anxiety. Diarrhea is characterized by frequent watery or loose stools. Diarrhea can be caused from a wide variety of factors, physical or otherwise.