How can you tell if you have lice or not? - briefly
Inspect the scalp and hair for live insects, moving white or brown nits attached within ¼ inch of the hair shaft, and note persistent itching. If any of these signs are present, an infestation is confirmed.
How can you tell if you have lice or not? - in detail
Lice infestations become apparent through several observable signs. Itching that intensifies after a night’s sleep often signals the presence of parasites, as the insects feed on blood and release saliva that irritates the scalp. A fine, grayish or white speck attached to hair shafts—commonly called a nit—indicates eggs that have been laid near the scalp. Live insects, roughly the size of a sesame seed, may be seen moving among the strands, especially near the nape of the neck and behind the ears.
To confirm an infestation, perform a systematic inspection:
- Separate hair into small sections using clips or hair ties.
- Use a bright light and a magnifying glass or a handheld loupe.
- Run a fine‑toothed lice comb from the scalp outward, wiping the comb on a white tissue after each pass.
- Examine the tissue for live insects or attached nits; nits are firmly glued to the hair shaft and do not slide easily when the hair is pulled.
- Repeat the process on all areas of the head, including the crown, sides, and behind the ears.
Differentiating lice from dandruff or debris is essential. Dandruff flakes are loose, yellowish, and can be brushed away, whereas nits remain fixed close to the scalp. Live lice move quickly when disturbed; they may also be visible on the shoulders or clothing, especially after prolonged contact with an infested person.
If the inspection reveals multiple live insects or numerous nits within a centimeter of the scalp, an infestation is confirmed. In such cases, seek professional guidance to select an appropriate treatment regimen and to prevent re‑infestation through thorough cleaning of personal items and household textiles.