Iron deficiency occurs when you do not have enough iron for your red blood cells to carry oxygen to your tissues. It causes fatigue and weakness.| Health
Insulin is a hormone that regulates blood sugar. Some people with diabetes can't make enough insulin and need to inject it as a medication.| Health
Common symptoms of Irritable Bowel Syndrome (IBS) include stomach pain, constipation, diarrhea, bloating, nausea, and fatigue, among others.| Health
Dehydration, when you lose more water than you take in, causes dark urine, headaches, and more. Drink 9-13 cups of fluids a day to prevent dehydration.| Health