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Symptoms Beginning With I
7 symptoms in this guide begin with the letter I. 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 |
|---|---|---|
| Indigestion | Digestive | Indigestion (dyspepsia) is a cluster of upper-abdominal symptoms — fullness during or after meals, bloating, belching, mild nausea and a dull ache under the ribs. It is… |
| Insomnia | Mind & Sleep | Insomnia means difficulty falling asleep, staying asleep, or waking too early, despite adequate opportunity — with daytime consequences: fatigue, poor concentration… |
| Irregular heartbeat | Chest & Heart | An irregular heartbeat means the pulse does not keep a steady rhythm — it may feel like extra beats, missed beats, or a completely irregular fluttering. The best-known… |
| Irregular periods | Women's Health | Irregular periods means cycles that vary a lot in length, arrive unpredictably, or have changed pattern from your usual — cycles shorter than about three weeks or longer… |
| Itchy bottom | Digestive | An itchy bottom (pruritus ani) is itching around the anus, often worse at night or after opening the bowels. It is common and usually driven by a cycle of irritation… |
| Itchy skin | Skin | Itchy skin (pruritus) is the sensation that makes you want to scratch — with or without a visible rash. Itch has its own nerve pathways and its own long list of causes… |
| Itchy skin with no rash | Skin | Itchy skin with no rash means intense itching where the skin itself looks normal — nothing to see except scratch marks. Because the primary event is not in the skin… |
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.