| Facial Neuralgia | See Trigeminal Neuralgia. |
| Farsighted | See Farsightedness. |
| Farsightedness | |
| Fasting Blood Sugar | |
| Fatty Acid | See Fatty Acids. |
| Fatty Acids | |
| Fatty Liver | |
| FBS | See Fasting Blood Sugar. |
| FDA | The (American) Food and Drug Administration. It is the official government agency that is responsible for ensuring that what we put into our bodies - particularly food and drugs - is safe and effective. |
| Febrifuge | |
| Febrile | Having to do with a fever. |
| Fecal Lubricant | An example of such a laxative is liquid paraffin, which is indigestible and absorbed only to a small extent. It penetrates and softens the feces, and coats the surface with an oil film, which facilitates its passage through the intestine. It is considered to have a usefulness as an occasional laxative in situations where straining at the stool must be avoided, but it has several drawbacks which make it unsuitable for regular use. |
| Fecal Lubricants | See Fecal Lubricant. |
| Fecal Softener | These act by lowering the surface tension of the intestinal contents, allowing fluid and fat to penetrate, emulsify and soften fecal material for easier elimination. The feces are kept soft, and evacuation is achieved without straining. An example is docusate sodium, an anionic surfactant that also exerts a stimulant laxative effect similar to that of the anthraquinones. |
| Fecal Softeners | See Fecal Softener. |
| Femtoliter | 0.000000000000001 or one quadrillionth of a liter. |
| Fever Blister | See Cold Sore. |
| Fever Blisters | See Cold Sore. |
| Fibrinolysis | |
| Fibrinolytic | |
| Fibroblast | |
| Fibroblasts | See Fibroblast. |
| Fibroids | See Leiomyomas. |
| Fibroma | See Fibromas. |
| Fibromas | |
| Fibromyalgia | |
| Fibromyoma | See Leiomyomas. |
| Fibrosarcoma | |
| Fibrosarcomas | See Fibrosarcoma. |
| Fibrous Histiocytoma | See Fibromas. |
| Fibrous Histiocytomas | See Fibromas. |
| Fibrous Tissue | |
| First-Degree Burn | Burn involving only the epidermis and causing irritation and edema without blisters. |
| Fistula | |
| fL | See Femtoliter. |
| Flatulence | |
| Flavonoid | See Bioflavonoid. |
| Flavonoids | See Bioflavonoid. |
| Flax | |
| Flax Oil | See Flax. |
| Flax Seed | See Flax. |
| Flexor | |
| Flexors | See Flexor. |
| Flux | |
| FMS | See Fibromyalgia. |
| Folic Acid | |
| Free Radical | |
| Free Radicals | See Free Radical. |
| Fructose | A simple sugar which occurs naturally in fruit or honey. |
| Fungistatic | Inhibiting the growth of fungi. |
| Furuncle | See Boil. |
| Furuncles | See Boil. |
| Furunculosis | |
