The two most likely possibilities are:
1. Anal fissure (a small tear near the anus)
Usually develops after passing hard stools or straining.
Causes pain, burning or discomfort during or after passing stools.
Typically produces fresh, bright-red blood.
Blood may be seen in the toilet bowl or on toilet paper.
2. Haemorrhoids (piles)
Swollen blood vessels around or inside the anus.
Can cause painless, bright-red bleeding during bowel movements.
Sometimes blood drips into the toilet bowl.
May be associated with constipation and straining.
Next Steps
Get a clinical examination, including a perianal examination and digital rectal examination if appropriate.