Early PH symptoms in children are much the same as they are in adults: exercise intolerance, shortness of breath, and blue-tinged lips and nails. Because children run around significantly more than adults, they are much more likely to get dizzy or faint with exercise or be prone to more breathlessness. Other symptoms can include fatigue, paleness, breathlessness, “asthma-like" symptoms, pounding or too-rapid heartbeat, chest pain, poor appetite, sweating, rapid breathing, and “failure to thrive”. As it is difficult for young children to express how they are feeling, it may take time for some of these symptoms to get noticed. Also, children will often push themselves harder than adults, hence the likelihood for dizziness or fainting.