Hello
Welcome to health care magic.
Visible bleeding after defaecation can be because of haemorrhoids/
anal fissure if blood is of bright colour as you described.
Haemorrhoids may or may not be associated with pain at anal region.
Anal fissures are usually associated with
severe pain.
Both the conditions are caused and exaggerated by by straining during defaecation and
constipation.
If I were your treating doctor,I would recommend ,
-Take
stool softener liquid paraffin 3 tsps at bed time for 3 successive nights.
-Increase intake of foods like bananas,green leafy vegetables,raisins,brans like oats.Supplement it with adequate intake of water as minimum 8-10 glasses per day.
-Keep body weight within control by regular walking for atleast 30 minutes.
-Continue doing timely follow up with your doctor for bowwel cancer as it is one of the cause of constipation in your case.
Hope I answered your query.
Wish you good health