Hello, at your father's age that can be because of gingivitis . you should definitely visit a dentist

Proper check up is needed. Bleeding is from gums or internal that has to be diagnosed. Then proper treatment can be initiated.

Bleeding from Mouth is indicative of some problems with gums. he may have plaque & Tartar deposition over teeth resulting into gums swelling or pocket formation. There are also some other reasons for bleeding. We need a clinical picture along with some clinical assessment

Please visit a dentist near you and get him checked for any dental related problem.

Hello dear, visit a dentist and get it checked . better to see it clinically for proper diagnosis and treatment plan.

Hi Sir/Mam , is this happend only once or more times, is bleeding is along with the cough , or bleeding was just from the mouth when he spit , if it is from inside when he cough , you should consult physician immediately, if it is just from oral cavity , it can be possibility of inflammation of gums , where you need to check with the dentist , DR.Venkat VDETNIS DENTAL CARE , Hyderabad

Please visit a nearest dentist as soon as possible to check for any oral cause of bleeding... As your father has other medical problems as well and I suppose he will be taking some anti platelet drugs... It is necessary to know the cause of such a bleeding as soon as possible

Usually blood thinners are given in heart patient. First consult your cardiologist urgently.

Hello dear, This is not dental related bleeding. It is something severe. Visit a general physician asap. Or just go to the nearest casualty of a reputed hospital. They will guide u to get some tests done. Take care.