The symptoms of purpura are skin symptoms, gastrointestinal symptoms, joint symptoms, and urinary symptoms, such as skin purpura, abdominal pain, joint swelling and pain, hematuria, etc. The symptoms of purpura are not only skin symptoms, but also joint symptoms. 1. Skin symptoms: the main manifestation of patients with purpura is skin purpura, purpura of varying sizes, often higher than the surface of the skin, the color is purplish-red, the pressure does not fade, can be fused into a piece. If serious, ulcers or necrosis may occur. 2. Gastrointestinal symptoms: some patients will also have abdominal pain, mostly paroxysmal severe colic, to the umbilical cord or lower abdomen obvious, can be accompanied by diarrhea, blood in the stool and other symptoms, severe cases will be vomiting, acid reflux. 3. Joint symptoms: patients with purpura may also have joint symptoms, manifested as joint swelling, often involving large joints, such as knees, ankles, wrists, etc., may be single or multiple, or wandering. Symptoms usually worsen with activity. 4. Urinary system symptoms: due to the increased permeability of the capillaries of the urinary tract mucosa, patients will have hematuria, micro-proteinuria and so on. If it develops into acute renal failure, the prognosis is poor. The appearance of the above symptoms, considered to be suffering from purpura caused by the disease, it is recommended to seek medical examination, a clear diagnosis, specific treatment under the guidance of physicians.