Ageing presents both challenges and opportunities. It will increase demand for primary health care and long-term care, require a larger and better trained workforce and intensify the need for physical and social environments to be made more age-friendly. Yet, these investments can enable the many contributions of older people – whether it be within their family, to their local community (e.g. as volunteers or within the formal or informal workforce) or to society more broadly.

WHO supports countries to ensure that their national adolescent health responses are evidence-based and take account of the values and preferences of adolescents. 

Improving the evidence base on adolescent health is crucial. WHO supports countries to improve measurement and  strengthen data, conducts research, and shares best practice. 

Each year, almost half of all pregnancies – 121 million – are unintended, and six out of ten unintended pregnancies end in induced abortion. When an unsafe abortion is carried out to terminate a pregnancy, there can be devastating and long-term physiological, financial, and emotional costs to the woman and her family, as well as to her community at large. 

Each year, almost half of all pregnancies – 121 million – are unintended, and six out of ten unintended pregnancies end in induced abortion. When an unsafe abortion is carried out to terminate a pregnancy, there can be devastating and long-term physiological, financial, and emotional costs to the woman and her family, as well as to her community at large. 

Adolescence is the phase of life between childhood and adulthood, from ages 10 to 19. It is a unique stage of human development and an important time for laying the foundations of good health.

Adolescents experience rapid physical, cognitive and psychosocial growth. This affects how they feel, think, make decisions, and interact with the world around them. 

Alcohol is a toxic and psychoactive substance with dependence producing properties. In many of today’s societies, alcoholic beverages are a routine part of the social landscape for many in the population. This is particularly true for those in social environments with high visibility and societal influence, nationally and internationally, where alcohol frequently accompanies socializing. In this context, it is easy to overlook or discount the health and social damage caused or contributed to by drinking.

Depression is a common mental disorder affecting more than 264 million people worldwide. It is characterized by persistent sadness and a lack of interest or pleasure in previously rewarding or enjoyable activities.  It can also disturb sleep and appetite; tiredness and poor concentration are common. Depression is a leading cause of disability around the world and contributes greatly to the global burden of disease. The effects of depression can be long-lasting or recurrent and can dramatically affect a person’s ability to function and live a rewarding life.

The leishmaniases are a group of diseases caused by protozoan parasites from more than 20 Leishmania species. These parasites are transmitted to humans by the bite of an infected female phlebotomine sandfly, a tiny – 2–3 mm long – insect vector.

There are three main forms of the disease: cutaneous leishmaniasis (CL), visceral leishmaniasis (VL), also known as kala-azar, and mucocutaneous leishmaniasis (MCL). CL is the most common form, VL is the most severe form and MCL is the most disabling form of the disease.

Symptoms may occur within 1 year but can also take as long as 20 years or even more to occur.

Clinical signs are easy to observe. Skin lesion has usually a different pigmentation than the surrounding normal skin (less pigmented, reddish or copper-coloured) and may have various aspects (flat, raised or nodules). Skin lesion can be single or multiple and may show a loss of sensation in the skin.

Skin smears are also used to diagnose leprosy.

People infected with filariasis who have microfilaraemia or a positive antigen test should receive antifilarial drug treatment to eliminate microfilariae. Unfortunately, the medicines available have limited effect on adult worms. Treatment also involves the management of morbidity and disability prevention (MMDP) that includes simple hygiene measures, such as basic skin care and exercise, to prevent acute attacks and progression of lymphoedema to elephantiasis. For management of hydrocoele, surgery may be appropriate.

There is as yet no proven treatment available for Marburg virus disease. However, a range of potential treatments including blood products, immune therapies and drug therapies are currently being evaluated. Supportive care – rehydration with oral or intravenous fluids – and treatment of specific symptoms improves survival. 

Illness caused by Marburg virus begins abruptly, with high fever, severe headache and severe malaise. Muscle aches and pains are a common feature. Severe watery diarrhoea, abdominal pain and cramping, nausea and vomiting can begin on the third day. Diarrhoea can persist for a week. The appearance of patients at this phase has been described as showing “ghost-like” drawn features, deep-set eyes, expressionless faces and extreme lethargy. A non-itchy rash has been noted between 2 and 7 days after the onset of symptoms. 
 

Universal health coverage can only be achieved when there is affordable access to safe, effective and quality medicines and health products. WHO works with partners and Member States to strengthen regulation, including post-marketing surveillance, and to eliminate substandard and falsified medicines. It also develops international norms and standards so that countries worldwide can regulate health products and technologies consistently.

Mental health conditions are increasing worldwide. Mainly because of demographic changes, there has been a 13% rise in mental health conditions and substance use disorders in the last decade (to 2017). Mental health conditions now cause 1 in 5 years lived with disability. Around 20% of the world’s children and adolescents have a mental health condition, with suicide the second leading cause of death among 15-29-year-olds. Approximately one in five people in post-conflict settings have a mental health condition.

WHO works with Member States and partners to prevent micronutrient deficiencies though a number of programmes and following the WHO 2016–2025 nutrition strategy. These programmes include iron and folic acid supplementation, high dose vitamin A supplementation, the promotion of breastfeeding, fortification of foods with micronutrients, and healthy, diverse diets containing foods naturally rich in vitamin and minerals.