I frequently experience tongue pain and ulcers, and a doctor diagnosed squamous cell epithelial dysplasia. What is this condition, and can it progress to tongue cancer? (Lam Ngo, 55, Ho Chi Minh City)

I often experience nasal congestion and a runny nose, and my doctor diagnosed a deviated septum. What causes this condition, how is it treated, and is surgery necessary? (Linh Trang, 25, Can Tho)

I have prolonged hoarseness; should I avoid coffee, and how can I recover my voice? (Mai Lan, 45, TP HCM)