I highly doubt it ! Never heard anything like that before. I think you should see your Doctor as there is something else that could be seriously wrong.
no I don't think so.
Sex? No. You're thinking of karate sparring practice without the pads. You've got to remember to wear the pads!
There's no possible way for sex to cause blood to seep out through your mouth. It's definitely something else that's causing you to do that.
Spitting up blood indicates the presence of bleeding that may originate in the digestive tract or in the respiratory system. It may be caused by many different conditions, and the severity varies among individuals. It may accompany vomiting if it is from a gastrointestinal source, or it may occur with coughing if it is from a respiratory source.
So if it were to be from a respiratory source, one possible explanation could be pneumonia. However I'm not going to assume anything, and it could be best to consult your doctor about it first.
Common gastrointestinal causes of spitting up blood are inflammation and infections, such as the stomach inflammation called gastritis. Conditions of the mouth such as gum disease and tooth extraction may cause spitting blood.
This is what gastritis could look like on a less detailed scale.
Spitting blood that comes up with a cough is commonly associated with lung cancer, bronchitis, and pneumonia (again, won't assume anything). These may cause spitting up of bright red blood, rust-colored mucus, or mucus that contain streaks of blood.
Pulmonary edema, congestive heart failure, or a perforated or collapsed lung (pneumothorax) from trauma may be associated with spit-up or coughed-up blood that appears bubbly because it is mixed with air and mucus.
The frequency of spitting blood and the amount of blood produced vary greatly, depending on the source of the bleeding. Symptoms of blood loss include lightheadedness, dizziness, fainting, or difficulty breathing.
It is rare for spitting blood to be so severe as to lead to serious complications, such as shock. However, people with significant blood loss from severe spitting blood may have serious medical conditions that require emergency hospitalization and treatment.
Left untreated, severe spitting blood can result in a life-threatening loss of blood. Seek immediate medical care (call 911) for serious symptoms, such as pale skin or pallor and difficulty breathing, severe abdominal pain, vomiting blood or black material, or change in level of consciousness. I wish you the best of luck.