What does a tongue with red marks all over it mean, it is uncomfortable?

Need to examine: It is not feasible to provide a meaningful opinion without examining you, however it may due to vitamin deficiency. Try taking multivitamin pills. If it does not improve after daily vitamin supplementation for a week, it would be prudent to see a doctor. Wish you good health! - Have a diet rich in fresh vegetables, fruits, whole grains, milk and milk products, nuts, beans, legumes, lentils and small amounts of lean meats. Avoid saturated fats. Drink enough water daily, so that your urine is mostly colorless. Exercise at least 150 minutes/week and increase the intensity of exercise gradually. Do not use tobacco, alcohol, weed or street drugs in any form. Practice safe sex, if you have sex. Get HPV vaccine, if you are under 27 years of age.