Sciatica
Pain affecting the back, hip, and outer side of the leg, caused by compression of a spinal nerve root in the lower back, often to degeneration of an intervertebral disk.

Headache can be caused by stress, diet, some medications, neck, jaw, nerve or hormonal problems, and eye, ear, nose and throat conditions. Since recurring headache can be caused by many factors working together, it's important to see your doctor and other qualified healthcare experts. Treatment will depend on the cause.

Tension headaches
Tension headaches, the most common type, feel like a constant ache or pressure around the head, especially at the temples or back of the head and neck. Not as severe as migraines, they don't usually cause nausea or vomiting, and they rarely halt daily activities.

An allergy is a hypersensitivity disorder of the immune system. Allergic reactions occur when a person's immune system reacts to normally harmless substances in the environment. A substance that causes a reaction is called an allergen. These reactions are acquired, predictable, and rapid.

Fatigue (also called exhaustion, tiredness, lethargy, languidness, languor, lassitude, and listlessness) is a subjective feeling of tiredness which is distinct from weakness, and has a gradual onset. Unlike weakness, fatigue can be alleviated by periods of rest. Fatigue can have physical or mental causes.