The most needed means that change nature are those that warm, for example, a medicinal bandage made from Zift. They also use olive oil in which fox was boiled - we describe it in the paragraphs on pain in the joints - as well as olive oil in which hyena was boiled. Pine resin is also very useful.
Know that the treatment of most nerve diseases focuses on the back of the brain, unless the disease is in the face, then the place where the nerve begins, the moving organ with the diseased nerve.
Nerves are harmed by some substances and benefited by other substances, many of which we have already mentioned in the sections of Book Two on simple medicines. This is taken into account only for such conditions and diseases that are inherent specifically to the nerves. Nerve-strengthening medicines for drinking include calamus jam, beaver stream, pine nut kernels, fried hare brain and especially Greek lavender; They drink it every day, one dirham in the form of pills or with honey drink. The most suitable water for such patients is rainwater. Moderate exercise and hot oils are also beneficial for them. Things that are harmful to the nerves include excessively frequent copulation, sleeping on a full stomach, drinking ice-cold water and water with a lot of sugar, as well as increased consumption of wine, because wine burns strongly and, turning into vinegar, causes cooling. Anything that is sour, swelling and strongly cooling, as well as frequent bloodletting, is harmful to the nerves.
In this article we want to talk about nerve diseases that depend on nature or blockages. As for tumors and ulcers on the nerves, we will postpone this until the Book that follows this Book.
Know that cold water damages the nerves, making them unable to absorb the fluids present in them, which turn into immature mucus. Know also that agaric greatly strengthens, warms and cleanses the nerves.