The chemical element phosphorus can be found in the cellular fluid of all living tissue. Phosphorus plays a vital role in the activity of the body's cells, most importantly in the transfer of genetic information. Many phosphorus compounds are used commercially in toothpaste, fertilizer, and laundry detergent. Phosphorus poisoning causes irritation of the mucous membranes and inflammation of tissue; over time, it can destroy bone. As a homeopathic remedy, minute doses are prescribed by practitioners for conditions accompanied by symptoms of fatigue and nervousness with a tendency to bleed easily and an unquenchable thirst for cold water. Pure phosphorus is diluted in large quantities of milk sugar to prepare the homeopathic remedy. Phos. is good for fear and anxiety that causes nervous tension, insomnia, and exhaustion. It is also used to treat circulatory problems, such as cold fingers and burning hot extremities. Profuse bleeding, for example, in nosebleeds, bleeding gums, heavy menstrual flow, and bleeding from the stomach lining is eased by Phos. This remedy is good for digestive complaints, such as nausea and vomiting due to food poisoning or stress (in which ice-cold foods and drinks are craved and vomited as soon as they become warm in the stomach), stomach flu, stomach ulcers indicated by a saliva-filled mouth, and heartburn. Respiratory problems, namely asthma, bronchitis, and pneumonia where there is tightness in the chest or breastbone, are alleviated by Phos. This remedy is also given for dry, tickly coughs that sometimes cause retching and vomiting, and phlegm streaked with dark red blood. It is also helpful for headaches that are worse before a thunderstorm and laryngitis. Ailments helped by Phos. are characterized by burning pain.