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Symptoms Beginning With F
15 symptoms in this guide begin with the letter F. Every name links to a plain-language page covering what the symptom can feel like, the conditions it can be associated with, its red flags, and what a clinician may do.
A B C D E F G H I J K L M N O P R S T U V W
| Symptom | Category | What it can feel like |
|---|---|---|
| Fainting | Brain & Nerves | Fainting (syncope) is a brief loss of consciousness caused by a temporary drop in blood flow to the brain — you go limp, fall, and recover quickly and completely… |
| Fatigue | General | Fatigue is a persistent tiredness that does not lift properly with rest — feeling drained, heavy and without energy for ordinary tasks. It is different from normal… |
| Febrile seizures | Children | A febrile seizure is a fit triggered by fever in a young child (typically 6 months to 5 years), when the immature brain reacts to a rapidly rising temperature. The child… |
| Feeling anxious | Mind & Sleep | Feeling anxious means persistent worry, tension and apprehension that is hard to switch off — racing thoughts, restlessness, muscle tension, poor concentration… |
| Feeling cold all the time | General | Feeling cold all the time means you reach for extra layers when others are comfortable, with cold hands and feet and sometimes a general chilliness that a warm room does… |
| Feeling full quickly when eating | Digestive | Feeling full quickly (early satiety) means your stomach feels uncomfortably full after only a few mouthfuls, long before you have eaten a normal meal. Occasional… |
| Feeling generally unwell (malaise) | General | Feeling generally unwell — malaise — is the whole-body sense that something is not right: heavy, achy, off your food, unable to concentrate, without one single symptom… |
| Fever | General | A fever is a body temperature that is higher than usual — the body deliberately turns its thermostat up, most often while fighting an infection. It usually comes with… |
| Fever in children | Children | Fever in children means a temperature of 38°C (100.4°F) or above. Fever itself is the immune system working, not a disease — what matters is the child's age, how they… |
| Fever that keeps coming back | General | A fever that keeps coming back means fevers that settle, then return days or weeks later in a repeating pattern. In children this is often simply one virus after… |
| Flaky scalp (dandruff) | Skin | A flaky scalp means visible white or yellowish scales shedding from the scalp, often with itching. At the mild end it is dandruff — an inflammatory reaction to the… |
| Flank pain | Urinary | Flank pain is pain in the side of the body, between the ribs and the hip, often felt in the back on one side. Pain here is classically linked to the kidney — the… |
| Flashes and floaters | Head & Senses | Floaters are drifting specks, threads or cobwebs that move with the eye, caused by shadows from tiny clumps in the eye's gel. Flashes are brief flickers of light… |
| Foamy urine | Urinary | Foamy urine means the urine forms persistent foam or froth in the bowl that does not quickly disperse — different from a few bubbles that vanish. Persistent foam can be… |
| Foot pain | Muscles & Joints | Foot pain covers a large territory: the ball of the foot (aching or burning after standing), the arch, the toes (bunions, hammer toes, gout in the big toe), and pain… |
Please note: This page is educational information about a symptom. A symptom alone cannot diagnose any condition, and the causes listed here are possibilities, not a diagnosis. If you are worried about a symptom — especially one that is new, severe, getting worse or not going away — please see your own clinician, who can examine you and arrange tests. In an emergency, call your local emergency number.