Inflammatory bowel disease, or IBD, describes Crohn’s disease and ulcerative colitis, two chronic diseases that cause inflammation in the intestines. IBD, which affects about 3 million adults in the United States, is an autoimmune disorder — a condition in which the body’s immune system attacks healthy tissues. Its symptoms include...

Water in California’s Central Valley contains enough manganese to cause cognitive disabilities and motor control issues in children, and Parkinson’s-like symptoms in adults.