Uhthoff’s Phenomenon Spoiler alert: your body really gets confused thanks to MS. One of the ways your body shows it is Uhthoff’s Phenomenon, which is blurry or reduced vision caused by overheating. Other Terms Speech Pathologist Experts to help with speech and swallowing issues. Spinal Tap A common procedure to help diagnose MS. Tremors Shaking symptoms are often linked to MS. Trigeminal Neuralgia The feeling of acute pain in the face. View More