A hug is a form of physical intimacy

Physical intimacy

Physical intimacy is sensual proximity or touching. It can be enjoyed by itself or be an expression of feelings which people have for one another...

, that usually involves closing or holding the arm

Arm

In human anatomy, the arm is the part of the upper limb between the shoulder and the elbow joints. In other animals, the term arm can also be used for analogous structures, such as one of the paired forelimbs of a four-legged animal or the arms of cephalopods...

s around the neck, back, or waist of another person; if more than two persons are involved, this is referred to as a group hug. A hug, sometimes in association with a kiss

Kiss

A kiss is the act of pressing one's lips against the lips or other body parts of another person or of an object. Cultural connotations of kissing vary widely. Depending on the culture and context, a kiss can express sentiments of love, passion, affection, respect, greeting, friendship, and good...

, eye contact

Eye contact

Eye contact is a meeting of the eyes between two individuals.In human beings, eye contact is a form of nonverbal communication and is thought to have a large influence on social behavior. Coined in the early to mid-1960s, the term has come in the West to often define the act as a meaningful and...

 or other gestures, is a form of nonverbal communication

Nonverbal communication

Nonverbal communication is usually understood as the process of communication through sending and receiving wordless messages. Messages can be communicated through gestures and touch , by body language or posture, by facial expression and eye contact...

. Depending on culture, context and relationship

Interpersonal relationship

An interpersonal relationship is an association between two or more people that may range from fleeting to enduring. This association may be based on limerence, love, solidarity, regular business interactions, or some other type of social commitment. Interpersonal relationships are formed in the...

, a hug can indicate familiarity, love

Love

Love is an emotion of strong affection and personal attachment. In philosophical context, love is a virtue representing all of human kindness, compassion, and affection. Love is central to many religions, as in the Christian phrase, "God is love" or Agape in the Canonical gospels...

, affection

Affection

Affection or fondness is a "disposition or rare state of mind or body" that is often associated with a feeling or type of love. It has given rise to a number of branches of philosophy and psychology concerning: emotion ; disease; influence; state of being ; and state of mind...

 or friendship

Friendship

Friendship is a form of interpersonal relationship generally considered to be closer than association, although there is a range of degrees of intimacy in both friendships and associations. Friendship and association are often thought of as spanning across the same continuum...

. One person may hug another as an indication of support, comfort, and consolation. A hug can be a demonstration of affection and emotional warmth, sometimes arising out of joy or happiness at meeting someone. Sometimes hugs are a romantic exchange.

Unlike some other forms of physical intimacy, when both parties mutually engage in the act, a hug can be practiced publicly and privately without stigma

Social stigma

Social stigma is the severe disapproval of or discontent with a person on the grounds of characteristics that distinguish them from other members of a society.Almost all stigma is based on a person differing from social or cultural norms...

 in many countries, religions and cultures, within families, and also across age and gender lines, but is generally an indication that people are familiar with each other. An unexpected hug can be regarded as an invasion of a person's personal space

Personal space

Personal space is the region surrounding a person which they regard as psychologically theirs. Most people value their personal space and feel discomfort, anger, or anxiety when their personal space is encroached. Permitting a person to enter personal space and entering somebody else's personal...

, but if it is reciprocated it is an indication that it is welcome. Also, a person, especially a child

Child

Biologically, a child is generally a human between the stages of birth and puberty. Some vernacular definitions of a child include the fetus, as being an unborn child. The legal definition of "child" generally refers to a minor, otherwise known as a person younger than the age of majority...

, may caress and hug a doll

Doll

A doll is a model of a human being, often used as a toy for children. Dolls have traditionally been used in magic and religious rituals throughout the world, and traditional dolls made of materials like clay and wood are found in the Americas, Asia, Africa and Europe. The earliest documented dolls...

 or stuffed animal

Stuffed animal

A stuffed toy is a toy sewn from cloth, plush, or other textiles, and stuffed with straw, beans, plastic pellets, cotton, synthetic fibres, or other similar materials. Stuffed toys are also known as plush toys A stuffed toy is a toy sewn from cloth, plush, or other textiles, and stuffed with straw,...

. Young children will also hug their parents when they feel threatened by an unfamiliar person.

Unlike a kiss, a hug is not usually undertaken as part of a ritual or social act. However, it is a custom in Spain and, by proxy, in Latin America

Latin America

Latin America is a region of the Americas where Romance languages  – particularly Spanish and Portuguese, and variably French – are primarily spoken. Latin America has an area of approximately 21,069,500 km² , almost 3.9% of the Earth's surface or 14.1% of its land surface area...

n countries for male friends to hug (as well as slap each other on the back) in a joyous greeting, such as on a New Year

New Year

The New Year is the day that marks the time of the beginning of a new calendar year, and is the day on which the year count of the specific calendar used is incremented. For many cultures, the event is celebrated in some manner....

. A similar hug, usually accompanied with a kiss on the cheek, is also becoming a custom among Western women to convey a joyous greeting and sorrowful parting. Also, in recent years it has become a practice amongst some teenage girls to greet and farewell each other with a hug. In May 2009, the New York Times reported that "the hug has become the favorite social greeting when teenagers meet or part these days" in the United States

United States

The United States of America is a federal constitutional republic comprising fifty states and a federal district...

. A number of schools in the United States have issued bans on hugs, which in some cases have resulted in student-led protests against these bans. In the Roman Catholic rite of the Holy Mass a hug may be substituted for a kiss or handshake during the kiss of peace ritual. Several cultures do not embrace as a sign of affection or love, such as the Himba

Himba

The Himba are an ethnic group of about 20,000 to 50,000 people living in northern Namibia, in the Kunene region . Recently they have built two villages in Kamanjab which have become tourist destinations...

 in Namibia

Namibia

Namibia, officially the Republic of Namibia , is a country in southern Africa whose western border is the Atlantic Ocean. It shares land borders with Angola and Zambia to the north, Botswana to the east and South Africa to the south and east. It gained independence from South Africa on 21 March...

.

Hugging has been proven to have health benefits. One study has shown that hugs increase levels of oxytocin

Oxytocin

Oxytocin is a mammalian hormone that acts primarily as a neuromodulator in the brain.Oxytocin is best known for its roles in sexual reproduction, in particular during and after childbirth...

, and reduce blood pressure

Blood pressure

Blood pressure is the pressure exerted by circulating blood upon the walls of blood vessels, and is one of the principal vital signs. When used without further specification, "blood pressure" usually refers to the arterial pressure of the systemic circulation. During each heartbeat, BP varies...

.

Hugging in non-humans

Patricia McConnell

Patricia McConnell

Patricia McConnell is an ethologist, author, advice columnist, and radio host. She holds a Ph.D. in zoology from the University of Wisconsin–Madison...

 notes that dog

Dog

The domestic dog is a domesticated form of the gray wolf, a member of the Canidae family of the order Carnivora. The term is used for both feral and pet varieties. The dog may have been the first animal to be domesticated, and has been the most widely kept working, hunting, and companion animal in...

s tend to enjoy being hugged less than humans and other primate

Primate

A primate is a mammal of the order Primates , which contains prosimians and simians. Primates arose from ancestors that lived in the trees of tropical forests; many primate characteristics represent adaptations to life in this challenging three-dimensional environment...

s do, since canines interpret putting a limb over another animal as a sign of dominance

Dominance signal

A dominance signal is used in a dominance hierarchy or pecking order to indicate an animal's dominance. Dorsal darkening has been suggested to represent a dominance signal in male tree lizards. Gorillas sometimes use chest-drumming as a dominance signal. Animals also sometimes use signals to...

.

Hugging is not particular to human beings, as there are many species of animals that engage in similar exchanges of warmth.