Hi, There are many reasons for node bleed. The causes vary from simple upper respiratory tract infection to severe hypertension. Since you say cauterisation was done, the concerned doctor would certainly have evaluated the cause. You should discuss with him regarding this. Dehydration n sports don t cause this. Since practises athletics post school which should be in the noon in scorching sun, the sun Stoke might have caused. Even nose picking can cause this. Use can use lubricating saline drops/sprays to prevent this. They soften the hardened mucous and help relieving the discomfort.