The malfunctioning protein causes viscous mucus to form in the lungs and intestinal tract.

Cystic fibrosis causes mucus to become thick and sticky, which can clog the lungs and cause serious problems.

Colds and allergies may cause too much mucus to be made or block the opening of the sinuses.

Cystic fibrosis is a disease that causes mucus in the body to become thick and sticky.

This disease causes very thick mucus in the lungs and problems with digesting food.

Cystic fibrosis causes mucus to become thick and sticky.

The cervix changes position in response to the same hormones that cause cervical mucus to be produced and to dry up.

Ulcerative colitis usually causes bloody diarrhea and mucus.

It is a chronic, progressive disease that causes mucus to become thick and sticky.

When you inhale a tobacco product, the smoke paralyzes the cilia, causing mucus to enter the lungs.