Your symptoms are most commonly caused by an anal fissure or haemorrhoids (piles). An anal fissure is a small tear in the anal lining, often caused by passing hard stools, which can lead to burning pain during and after defecation. Haemorrhoids are swollen veins in the anal area that can cause swelling, discomfort, and sometimes similar pain even without bleeding in the early stages. It is advisable to increase fibre intake and consult a doctor for an accurate diagnosis and appropriate treatment.