The pain is localised to particular area or whole breast is involved . Is it in one breast or both breast . Whether pain associated with lactation if u r a lactating mother, or during menstruation.
Next Steps
You can examine at home yourself in the mirror . Start from nipple in centre and go outside in circular fashion centrifugal way , look for any prominent lump.
Health Tips
Use good sports bra whole day , u can take off during sleep.
Avoid caffeine.
These few habit will relieve from pain.
If not relieved then u should consult general surgeon.