Not all headaches represent migraines, and migraine is not the only condition that can cause severe and debilitating headaches. For example, cluster headaches are very severe headaches that affect one side of the head in a recurrent manner (occurring in a cluster over time).The pain is sometimes described as drilling, and can be worse than migraine pain in some cases. Cluster headaches are less common than migraine.Tension headaches are a more common cause of headache. Thee occur due to contraction of the muscles of the scalp, face, and neck.n addition, many patients experience nausea or vomiting. The headache of a migraine often involves only one side of the head but in some cases, patients may experience pain bilaterally or on both sides. The pain of a migraine is often described as throbbing or pounding and it may be made worse with physical exertion.
The international normalized ratio (INR) is a calculation based on results of a PT and is used to monitor individuals who are being treated with the blood-thinning medication (anticoagulant) warfarin (CoumadinÂ®).he INR can be used to adjust a person's drug dosage to get the PT into the desired range that is right for the person and his or her condition. Warfarin may be prescribed for conditions such as: 1  Irregular heartbeat (atrial fibrillation). 2  The presence of artificial heart valves.
International normalized ratio (INR) which is a derivative of prothrombin time is a measurement of blood coagulation in the circulatory system. Both are used to determine the clotting rate of blood which can be affected by anticoagulant usage, liver damage and Vitamin K levels.