Defining health psychology

Health psychology is a branch of psychology that explores how mental and physical aspects of a person's life interact. It examines how thoughts, emotions, behaviours, and social relationships can affect an individual's overall physical health. It also involves using psychological principles to encourage healthy habits and prevent disease.

Understanding addiction

Addiction is a complex condition that develops when someone repeatedly uses a substance, such as alcohol or nicotine. What starts as something pleasurable can become an uncontrollable habit that disrupts everyday life, work, and relationships. Drug taking that escalates to abuse is a major public health problem that impacts society on multiple levels.

Mechanisms of tolerance in drug use

Tolerance develops as the body and brain adjust to repeated exposure to a drug, requiring higher doses to achieve the same effects that smaller amounts once provided. This occurs because neurons become less responsive over time.

How tolerance develops

With ongoing drug use, neurons adapt to higher neurotransmitter levels in the synapses, reducing their sensitivity. As a result, more of the drug is needed to produce the original response.

Physical dependence

Physical dependence arises when the body becomes so adapted to a drug that stopping its use causes significant physical upset. This is an adaptive state where the individual feels they cannot function without the substance, often driven by the need to avoid uncomfortable symptoms. Dependence can develop from repeated use, turning the drug into something perceived as essential for normal operation, primarily to prevent these effects.

Psychological dependence

Psychological dependence occurs when a person feels a strong mental or emotional need for a drug to function normally, even without physical changes in the body. This type of dependence focuses on the mind's reliance on the substance for positive feelings, such as boosted confidence or reduced anxiety. The compulsion here stems from the enjoyable effects the drug provides, leading to repeated use that can result in uncontrolled drug taking. Importantly, stopping does not trigger physical withdrawal.

Withdrawal symptoms and their causes

Withdrawal, also known as abstinence syndrome, refers to the range of physical symptoms that emerge when someone dependent on a drug reduces or stops its use. These symptoms occur as the brain and body attempt to return to normal functioning without the substance they have adapted to. This compensatory process produces the symptoms of withdrawal.

Examples of withdrawal symptoms

These physical reactions may include vomiting, shaking, headaches, and convulsions, and they vary by drug.