Teen & Adolescent Health Guide: For Teens and the People Who Love Them

If you are a teenager reading this: you are going through one of the most intense periods of biological, emotional, and social change any human being ever faces. What you are feeling — the mood swings, the awkwardness, the intense friendships, the moments of anxiety — is real, and most of it is normal. You are not broken. You are becoming.

If you are a parent reading this: your teenager is not trying to make your life difficult. The adolescent brain is quite literally under major construction until the mid-20s. Understanding what is happening in your teen's body and mind will help you support them — and will help you know when something needs medical attention.

Puberty and Physical Changes

For Girls

Puberty in girls typically begins between ages 8 and 13, with breast development usually the first sign. Menstruation (first period) typically occurs 2–3 years after breast development begins, usually between ages 11 and 14. Early periods are often irregular — this is normal. Significant period pain (dysmenorrhea) that interferes with school or daily activities is not something to just push through; it deserves evaluation. Polycystic ovarian syndrome (PCOS), a hormonal condition affecting ovulation, commonly presents in adolescence and can cause irregular periods, acne, and weight changes.

For Boys

Boys typically begin puberty between 9 and 14, with testicular growth the first sign, followed by pubic hair, growth in height, and voice changes. Gynecomastia — temporary breast tissue growth — occurs in 50–70% of boys during puberty and usually resolves within 1–2 years. It is not a sign of a serious condition, though it can feel embarrassing. Any testicular pain or unusual lumps should always be evaluated promptly.

Growth

The adolescent growth spurt is rapid — girls typically grow 6–11 cm per year during their peak year, boys 7–12 cm. This rapid growth creates real physical vulnerability, particularly to sports injuries involving growth plates (see below). It also dramatically increases nutritional needs, which many Filipino teens do not meet.

Mental Health in Teens

One in four adolescents worldwide will experience a mental health condition — most of which begin before age 24. In the Philippines, Filipino teenagers face a constellation of specific stressors: extreme academic pressure, strong family expectations, economic anxiety, and increasingly, the mental health toll of social media. Understanding the difference between normal teenage moods and clinical conditions is genuinely important.

Anxiety in Teenagers

Anxiety disorders are the most common mental health conditions in adolescence. A degree of anxiety is normal and healthy — it motivates preparation and caution. Clinical anxiety is when worry becomes disproportionate, persistent, and starts interfering with school attendance, social life, sleep, or physical health. Physical symptoms are common and real: headaches, stomachaches, racing heart, and dizziness. Filipino teens are particularly prone to school-related anxiety, with academic performance tied tightly to family pride and economic opportunity.

Depression in Teenagers

Teenage depression does not always look like adult depression. It often presents as irritability, anger, social withdrawal, loss of interest in activities they used to love, declining school performance, or changes in sleep patterns. A teenager who used to love basketball or choir and suddenly seems uninterested in everything deserves a gentle conversation — and if the pattern persists for more than two weeks, a medical evaluation. Depression in teens is eminently treatable, but it is under-recognised and under-treated in the Philippines.

Social Media and Mental Health

The evidence on social media and adolescent mental health is concerning, particularly for girls. Excessive social media use is associated with increased anxiety, depression, poor body image, and disordered eating in teenagers. The comparison dynamic — constantly viewing curated, filtered versions of peers' lives — is psychologically corrosive. This does not mean banning social media, which may cause more problems than it solves. It means having open conversations about what is real, setting reasonable screen time boundaries, and ensuring that offline social connection, physical activity, and sleep are protected.

Nutrition for Growing Bodies

Adolescence is a period of extraordinary nutritional demand. The teenage body is building bone mass, muscle, and brain architecture simultaneously. Nutritional deficiencies during this critical window have lasting consequences. Yet many Filipino teenagers — particularly girls — are both overweight and nutritionally deficient, a paradox driven by diets high in refined carbohydrates and processed foods but low in protein, calcium, iron, and micronutrients.

Key Nutrients for Teens

• Calcium: Peak bone mass is built during adolescence; 90% of adult bone mass is acquired by age 18. Filipino teens need 1,300 mg of calcium daily — roughly 3–4 servings of dairy or calcium-rich foods (tofu, sardines with bones, leafy greens). Low calcium in the teen years means brittle bones and osteoporosis in later life.
• Iron: Filipino teenage girls are at particularly high risk of iron deficiency anaemia due to menstrual losses and often insufficient dietary iron. Signs include fatigue, pallor, poor concentration, and poor academic performance. Red meat, fish, chicken, malunggay, and spinach are good sources; vitamin C improves absorption.
• Protein: Growing teenagers need more protein than most Filipino families provide — approximately 0.85 g per kg of body weight per day. A 55 kg teenager needs around 47 g of protein daily. Eggs, fish, chicken, legumes, and dairy are excellent sources.
• Vitamin D: Despite abundant Philippine sunshine, vitamin D deficiency is common due to sun avoidance and limited dietary sources. Vitamin D is essential for bone health, immune function, and mood.

What Filipino Teens Are Actually Eating

Studies of Filipino adolescent diets consistently show high consumption of instant noodles, fast food, rice, and sweetened beverages, with low intake of vegetables, fruit, fish, and dairy. This pattern drives rates of teenage obesity, anaemia, and micronutrient deficiency simultaneously. Practical improvements: replace sweetened drinks with water, add a vegetable to at least one meal per day, choose fish or eggs over processed meat, and eat breakfast.

Filipino Teen Issues: Context Matters

Academic Pressure

The Philippines has one of the most academically demanding school environments in Southeast Asia, and Filipino families place enormous cultural value on academic achievement. This creates intense pressure on teenagers that is a documented driver of anxiety, depression, sleep deprivation, and burnout. Teenagers should be sleeping 8–10 hours per night for optimal brain development and emotional regulation — but most Filipino students report sleeping far less during exam periods. Sleep deprivation impairs memory consolidation, emotional regulation, and academic performance — the very things students sacrifice sleep to improve.

Bullying

Bullying — including cyberbullying — affects a significant proportion of Filipino students and is associated with depression, anxiety, school avoidance, and in severe cases, suicidal ideation. Filipino cultural norms around resilience and not making trouble can make it difficult for victims to report bullying. If a teenager is suddenly avoiding school, appears fearful or withdrawn, or has unexplained physical complaints on school days, bullying should be considered.

Early Sexual Activity and Reproductive Health

The Philippines has one of the highest rates of teenage pregnancy in Southeast Asia. Access to age-appropriate reproductive health education is essential, but cultural and religious sensitivities often mean Filipino teenagers lack accurate information about their bodies, relationships, and reproductive health. The Responsible Parenthood and Reproductive Health Act provides a framework for access to services. Teenagers who are sexually active should have access to appropriate reproductive health care without fear of judgment.

Vaccines Teens Need

Sports Injuries and Growth Plate Concerns

Sports are enormously beneficial for teenagers — physical fitness, discipline, teamwork, mental health, and lifelong healthy habits all flow from adolescent sport participation. But the rapidly growing teenage body is vulnerable to specific injuries that adults do not face.

Growth plates — the cartilaginous areas at the ends of long bones where growth occurs — are the weakest point in a teenager's skeletal structure. Injuries that would be a simple sprain in an adult can fracture a growth plate in a teenager. Growth plate fractures require accurate diagnosis and sometimes specific treatment to ensure the bone grows correctly; a missed or mismanaged growth plate injury can cause permanent deformity or growth problems. Any significant joint injury in a teenager — particularly involving the knee, ankle, or wrist — should be evaluated with X-ray.

Common overuse syndromes in Filipino teen athletes include Osgood-Schlatter disease (pain below the kneecap, very common in fast-growing teenagers who play basketball, football, or badminton) and Sever's disease (heel pain in athletes). These are manageable with rest, physiotherapy, and appropriate activity modification — they do not require stopping sport entirely in most cases.

Substance Use Warning Signs

The Philippines has significant issues with adolescent tobacco, alcohol, and drug use — and the adolescent brain is particularly vulnerable to the neurological effects of substances during its critical developmental period. Nicotine vaping has become widespread among Filipino teenagers who may not understand they are using a highly addictive substance. Cannabis, shabu (methamphetamine), and prescription drug misuse also occur.

Parents should look for these warning signs in their teen:

• Sudden changes in friends or social group
• Unexplained changes in mood, energy, or motivation
• Declining school performance without clear explanation
• Secretive behaviour, hiding phone, lying about whereabouts
• Unusual smells on breath or clothing
• Bloodshot eyes, unexplained weight loss
• Missing money or valuables at home

If you suspect substance use, the most important thing is to stay connected rather than to react with anger. Punitive responses often drive the behaviour underground. CHH's Psychiatry department offers adolescent evaluation and support for both teens and families navigating substance concerns.

When Parents Should Bring Their Teen to a Doctor

Non-emergency but worth scheduling a visit for: irregular or very painful periods that affect daily life; significant acne not responding to over-the-counter treatment; persistent fatigue or unexplained weight changes; concerns about growth or development; any suspicious testicular lump; recurrent headaches; persistent anxiety or low mood that has lasted more than two weeks.

Teenagers often respond better to medical care when they have some privacy with their doctor. CHH's Pediatrics team creates a safe, confidential environment where teenagers can ask questions and share concerns they might not feel comfortable discussing in front of parents — while keeping parents appropriately informed.