Symptom
Brown leaf tips
Brown tips are where water reaches last. Anything that interrupts supply, from dry compost to salt build-up, shows there first. Houseplants are especially prone.
Look at watering, feeding and the air before anything else. Tips browning on all leaves at once points to the roots or the compost; on new leaves only, to dry air.
Likely causes
Ordered from the usual answer to the less likely one. Each links to the full problem.
Recorded on Chili peppers
Less likely on Chili peppers