As a child, assuming the sun to be a ripe mango, he once took flight to catch hold of it to eat. Indra, the king of devas observed this. He hurled his weapon, the Vajra (thunderbolt) at Hanuman, which struck his jaw. He fell back down to the earth and became unconscious. Upset, Vayu went into seclusion, taking the atmosphere with him. As living beings began to get asphyxiated, to pacify Vayu, Indra withdrew the effect of his thunderbolt, and the devas revived Hanuman and blessed him with multiple boons. However, a permanent mark was left on his chin (hanuhH in Sanskrit).

On ascertaining Surya, the Hindu deity of the sun to be an all-knowing teacher, Hanuman raised his body into an orbit around the sun and requested that Surya accept him as a student. But Surya refused, claiming that as he always had to be on the move in his chariot, it would be impossible for Hanuman to learn effectively. Undeterred by Surya's refusal, Hanuman enlarged his body; he placed one leg on the eastern ranges and the other on the western ranges and with his face turned toward the sun, made his request again. Pleased by his persistence, Surya accepted. Hanuman then moved (backwards, to remain facing Surya) continuously with his teacher, and learned all of the latter's knowledge. When Hanuman then requested Surya to quote his "guru-dakshina" (teacher's fee), the latter refused, saying that the pleasure of teaching one as dedicated as him was the fee in itself. But Hanuman insisted, and it was then that Surya asked him to help his (Surya's) spiritual son Sugriva.