An injection is an infusion method of putting fluid into the body, usually with a syringe and a hollow needle which is pierced through the skin to a sufficient depth for the material to be administered into the body.
A syringe is a simple reciprocating pump consisting of a plunger that fits tightly within a cylindrical tube.
Intramuscular and Subcutaneous Injections - Clinical Skills by Oxford Medical Education
An injection follows a parenteral route of administration; that is, administration via a route other than through the digestive tract.
How to Give Intradermal and Subcutaneous Injections | Medical, Health, First Aid by Bright Enlightenment
Since the process inherently involves a small puncture wound to the body, fear of needles is a common phobia.
Fear of needles, known in medical literature as needle phobia, is the extreme fear of medical procedures involving injections or hypodermic needles.
Penetrating trauma is an injury that occurs when an object pierces the skin and enters a tissue of the body, creating an open wound.
A phobia is a type of anxiety disorder, defined by a persistent fear of an object or situation.
There are several methods of injection or infusion used in humans, including intradermal, subcutaneous, intramuscular, intravenous, intraosseous, intraperitoneal, intrathecal, epidural, intracardiac, intraarticular, intracavernous, and intravitreal.
Intrathecal administration is a route of administration for drugs via an injection into the spinal canal, or into the subarachnoid space so that it reaches the cerebrospinal fluid and is useful in spinal anaesthesia, chemotherapy, or pain management applications.
Epidural administration is a medical route of administration in which a drug or contrast agent is injected into the epidural space of the spinal cord.
Intravenous therapy is the infusion of liquid substances directly into a vein.
Rodents used for research are often administered intracerebral, intracerebroventricular, or intraportal injections as well.
Long-acting forms of subcutaneous/intramuscular injections are available for various drugs, and are called depot injections.
Injections are among the most common health care procedures, with at least 16 billion administered in developing and transitional countries each year.
95% of injections are administered in curative care, 3% are for immunization, and the rest for other purposes, such as blood transfusions.
Immunization, or immunisation, is the process by which an individual's immune system becomes fortified against an agent.
Blood transfusion is generally the process of receiving blood or blood products into one's circulation intravenously.
In some instances the term injection is used synonymously with inoculation even by different workers in the same hospital.
The terms inoculation, vaccination, immunization and injection are often used synonymously to refer to artificial induction of immunity against various infectious diseases.
This should not cause confusion; the focus is on what is being injected/inoculated, not the terminology of the procedure.