Hi and welcome to Healthcaremagic. I understand your concerns and I will try to help you as much as I can. Yes, in most cases constipation is the only cause of blood due to hard stool and straining during defecation. SO if this doesnt improve after dietary changes you should consider other causes such as hemorrhoids, anal fissure or rectal polyps. These are primarily treated with stool softener, diet and sitzbaths. It is very important to take lot of fluids, probiotics, high fibre food and stool softeners to avoid hard stool and straining. If there is no improvement in next few weeks, then surgical management should be considered. Other causes may be more serious and include tumors or inflammatory bowel diseases and these should be ruled out with colonoscopy which must be done if there is low blood count present or rapid weight loss. Otherwise, you can see if conservative therapy will help and consult proctologist if necessary I hope I have answered you query. If you have any further questions you can contact us in every time. Kindly regards. Wish you a good health.