Essential Hypertension: This is the most common cause of hypertension in children, especially in the context of obesity. Obesity is a significant risk factor for the development of essential hypertension due to factors like insulin resistance, vascular dysfunction, and activation of the renin-angiotensin-aldosterone system.

Renal Disease: Conditions such as chronic kidney disease or glomerulonephritis can cause hypertension. Obesity can also contribute to the development of kidney disease.
Sleep Apnea: Often associated with obesity, sleep apnea can lead to hypertension due to intermittent hypoxia and increased sympathetic tone.
Endocrine Disorders: Conditions like hyperthyroidism or Cushing's syndrome can cause hypertension and may be associated with weight gain or obesity.

Pheochromocytoma: A rare tumor of the adrenal gland that can cause episodic or sustained hypertension. Although rare, it is crucial to consider due to its potential for severe consequences if left untreated.
Coarctation of the Aorta: A congenital condition characterized by narrowing of the aorta, which can lead to hypertension. It's essential to diagnose this condition early to prevent long-term cardiovascular complications.
Renal Artery Stenosis: Narrowing of the arteries that supply blood to the kidneys, which can cause hypertension. This condition requires prompt diagnosis and treatment to prevent kidney damage.

Hyperaldosteronism: A condition characterized by excessive production of aldosterone, leading to hypertension and hypokalemia. It is rare in children but can be associated with obesity.
Thyroid Disorders (e.g., Thyroid Storm): Although less common, severe thyroid disorders can cause hypertension and are important to consider, especially if there are other symptoms suggestive of thyroid dysfunction.
Neurogenic Causes: Such as increased intracranial pressure or certain brain tumors, which can cause hypertension. These are rare but critical to diagnose due to their potential impact on the central nervous system.