For thousands of years, head lice have been one of our largest hair-related burdens. These pesky creatures have evolved in tandem with our societies to such an extent that they are exclusively found amongst human communities. We can distinguish between three types of lice that affect people: body louse, pubic louse, and head louse. Out of these, the latter is the one that causes the most damage because it spreads extremely fast.
An itchy scalp is the most recognized and typical symptom of head lice. And with good reason. This sign tends to the first complaint amongst people who suffer from head lice. Many people believe that an itchy scalp is due to the head lice living in our heads, but this is a common misconception. The itchiness is a result of an allergic reaction caused by louse saliva. Even though itchiness is very common, it usually only appears a few weeks after the initial infestation. In some cases, there may not even be any itching because the host may not be allergic to the saliva.
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