One of the most debilitating symptoms caused by ulcerative colitis is dehydration. Dehydration refers to a condition where the body’s water level becomes critically low, causing symptoms like dizziness and fatigue. Ulcerative colitis can cause dehydration because of the water loss that occurs through diarrhea. This can also cause a shock for the body. To alleviate the symptoms of dehydration, make sure you consume plenty of water with your meals, and aim for at least eight glasses of water per day. If you suffer from lighter ulcerative colitis, dehydration won’t be as noticeable. On the contrary, in some cases, it can become severe.