What is contraindication?
contraindication is A clinical symptom, circumstance, condition indicating that the use of an otherwise advisable intervention would be inappropriate. A contraindication may be absolute or relative. An absolute contraindication is a situation which makes a particular treatment or procedure absolutely inadvisable. A relative contraindication is a condition which makes a particular treatment or procedure somewhat inadvisable, but does not rule it out (for example, X-rays in pregnancy).
source: A GLOSSARY OF TERMS FOR COMMUNITY HEALTH CARE AND SERVICES FOR OLDER PERSONS. World Health Organization, 2004.