| Kidney infection (pyelonephritis) |
| Kidney injury |
| Kidney removal |
| Kidney scan |
| Kidney stones |
| Kidney transplant |
| Kidney tumor |
| Kimmelstiel-Wilson disease |
| Kinins |
| Kinky hair disease |
| Kissing disease |
| Kleihauer-Betke stain |
| Klein-Waardenburg syndrome |
| Klinefelter syndrome |
| Klippel-Trenaunay syndrome |
| Klippel-Trenaunay-Weber syndrome |
| Klumpke paralysis |
| Knee arthroplasty |
| Knee arthroscopy |
| Knee cap dislocation |
| Knee injury – anterior cruciate ligament (ACL) |
| Knee injury – lateral collateral ligament (LCL) |
| Knee injury – medial collateral ligament (MCL) |
| Knee injury – meniscus |
| Knee injury – posterior cruciate ligament (PCL) |
| Knee joint replacement |
| Knee microfracture surgery |
| Knee pain |
| Knee replacement – partial |
| Knee replacement – total |
| Knee scope – arthroscopic lateral retinacular release |
| Knock knees |
| Knox-Out poisoning |
| KOH test |
| Koilonychia |
| Korsakoff psychosis |
| Krabbe disease |
| KTS |
| KUB |
| Kufs’ disease |
| Kuru |
| Kwashiorkor |
| Kyphoscoliosis |
| Kyphosis |
