While most develop under the skin, it’s possible to have a hematoma develop internally. Symptoms of internal hematomas depend on which organ(s) are involved. For example, hematomas of the lungs may cause bloody spit, coughing, and difficulty breathing while hematomas of the spleen may cause swelling of the abdomen or collapse. Other serious symptoms include seizures, comas, neurological damage, pain, and incontinence. These types of hematomas are very serious and require immediate medical attention.