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Black, Tarry Stools. Bleeding in the upper portion of your digestive system can cause black, tarry stools. Ulcers or another form of irritation in your esophagus or stomach known as gastritis can cause bleeding. When the blood mixes with digestive fluids, it takes on the appearance of tar.

The symptoms of mold exposure are;1.sneezing, 2.runny nose, 3.coughing, 4.wheezing, 5.watery eyes, 6.redness of the eyes, 7.itchy eyes, 8.skin irritation, or rash.

A variety of medical reasons can cause black stools that are also tarry with a foul smell. Blood that comes from higher up in the digestive tract (such as the esophagus or stomach) may turn stool black, which is called melena.

In some cases, mold in your home can make you sick, especially if you have allergies or asthma. Whether or not you're allergic to molds, mold exposure can irritate your eyes, skin, nose, throat, and lungs. Here's what you can do to combat mold problems, and take care of yourself and your home.

Blood in the stool means there is bleeding somewhere in your digestive tract. At other times it may visible on toilet tissue or in the toilet after a bowel movement as bright red blood. Bleeding that happens higher up in the digestive tract may make stool appear black and tarry.