What causes my tongue to feel rough?

A rough tongue can be caused by several factors, including dehydration, irritation from spicy or acidic foods, or underlying health conditions such as oral thrush or geographic tongue. Poor oral hygiene or habits like smoking can also contribute to a rough texture. Additionally, vitamin deficiencies, particularly B vitamins and iron, may play a role. If the roughness persists or is accompanied by other symptoms, it's advisable to consult a healthcare professional.