Concern about heading has grown, and several football associations have introduced limits, especially for children. The science is still developing, so it helps to separate what is known from what is not.
Concussions from head-to-head or head-to-ground contact are a clear, recognised risk and need proper management
Repetitive heading without concussion is a separate question; some studies have found associations with later brain health problems, but cause and effect is not fully established
Many guidelines now limit heading practice in youth football and reduce repetitive heading drills for adults
Neck strength and good technique may reduce head acceleration, although evidence is still limited
A practical approach many coaches use: keep heading practice to a small number of quality repetitions, use lighter or softer balls for technique work with youngsters, and avoid long crossing drills where the same players head dozens of times. Match heading is harder to control, but training volume can be.