Giữ đầu cố định. Xử lý khi bị nôn. Chườm túi nước đá để giảm sưng. Liên tục theo dõi nạn nhân.

Given the above summary, write a detailed text in English for it.
If someone has a head injury and is conscious, it’s important to stabilize his or her head while you are providing care or waiting for medical attention. Placing your hands on both sides of the person’s head can keep it from moving and causing further injury as well as allow you to provide any necessary first aid. Place a rolled up coat, blankets, or articles of clothing next to a victim’s head to stabilize it if you are providing first aid. Keep the person as still as possible with the head and shoulders slightly elevated.  Avoid removing any helmet a victim is wearing to prevent further injury. Avoid shaking a person, even if he or she seems confused or loses consciousness. You can simply tap the person without moving him or her. There may be vomiting present with some head injuries. If you’ve stabilized the head and the person begins vomiting, you’ll need to prevent choking. Rolling the person on to his or her side as one unit can minimize the risk of choking by vomiting.Make sure to support the person’s head, neck, and spine as you roll the individual to the side. If you or another person has swelling at the site of a head injury, use ice packs to reduce it. This can control inflammation and any pain or discomfort the person is experiencing.  Place ice on injury for 20 minutes at a time up to three to five times a day. Remember to get medical attention if the swelling doesn’t decrease within a day or two. If the swelling gets worse, is accompanied by vomiting and/ or severe headache, seek immediate medical attention. Use a commercial ice pack or fashion one with a bag of frozen vegetables or fruit.  Remove if it gets too cold or causes you pain. Putting a towel or cloth between your skin and the pack can prevent discomfort and frostbite. If a person injured his or her head, it’s a good idea to keep an eye on the person for a few days or until medical professionals arrive. This can alert you to provide assistance if the person’s vital signs change. It can also reassure and calm the injured person.  Watch...