However, passing mucus in the stool, especially if it is a new symptom, should still be mentioned to a physician at the next office visit. Mucus without an underlying cause, such as one of the pre-existing conditions mentioned above, is a change in bowel habits and should be reported to a physician immediately.
By Mayo Clinic Staff. Coughing up blood can be caused by a variety of lung conditions. Coughing up blood can take different forms: The blood may be bright red or pink and frothy, or it may be mixed with mucus. Also known as hemoptysis (he-MOP-tih-sis), coughing up blood, even in small amounts, can be alarming. However, producing a little blood-tinged sputum isn't uncommon and usually isn't serious.
Blood in stool. Blood in the stool means that a person is passing blood when they do a poo. The blood is not always red â sometimes it can be dark brown or black. There can be blood clots. Occasionally a person passes blood and mucus at the same time. The bleeding might be painful or it might be painless.