Well, Sakura could also hurt Naruto's heart in fanfiction by constantly comparing him unfavorably to Sasuke. She might say things like Sasuke is so much better in this or that aspect, making Naruto feel inadequate and unloved, especially since he has such deep feelings for her and is always trying to prove himself.
In some fanfictions, Sakura might hurt Naruto's heart by rejecting his love in a particularly cruel way. For example, she could publicly embarrass him when he confesses his feelings, which would be a huge blow to his self - esteem and his love for her.
In some fanfictions, Sakura might accidentally hurt Naruto during a training session. Maybe she uses a new jutsu she's not fully mastered and it goes wrong, hitting Naruto instead of the target.
Well, in some Narusaku fanfictions, Sakura might hurt Naruto emotionally by choosing Sasuke over him repeatedly. This can make Naruto feel rejected and unloved, causing him pain.
In some Sasunaru fanfictions, Sakura might hurt Naruto emotionally. For example, if she chooses Sasuke over Naruto in a very cruel way, it can break Naruto's heart. She could say mean things about his dreams or his past as an orphan, which would deeply wound him.
Naruto could also react with anger. He's not one to just take things lying down. If Sakura hurts him, he might lash out verbally. He could say things like 'I've always been there for you, and this is how you treat me?' expressing his frustration and pain. And then he might storm off, leaving Sakura to realize the impact of her actions.
Well, it could strengthen their bond. Naruto being hurt might make Hinata more protective and caring towards him. This could lead to Naruto realizing Hinata's true feelings for him more deeply, and in turn, he might start to see her in a new light, growing closer to her.
At first, it could create a rift. Naruto might be confused and hurt not just physically but also emotionally. He may question Sakura's true feelings towards him. Sakura, on the other hand, would probably feel guilty, which could lead to her avoiding Naruto, further straining their relationship.
It could be due to Sakura's feelings for Sasuke. If she's overly focused on Sasuke and Naruto gets in the way of her plans regarding Sasuke in some way, she might lash out and hurt Naruto without really meaning to cause serious harm.
Naruto often shows his care through his actions. He might use his healing techniques on Sakura if she's physically hurt. For instance, if she has a cut or a broken bone, Naruto could use his medical ninjutsu skills, which he has learned over time.
In other fanfics, Naruto might try to understand Sakura's perspective. He's a very forgiving person, so he could give her the benefit of the doubt and try to figure out what made her act in a way that hurt him. He might think that she had her reasons and try to work through it with her.
It could be that Anko is under some sort of mind - control in the fanfiction. And because of that, she attacks Naruto without really meaning to. Maybe she has been influenced by an enemy's genjutsu. So, she uses her powerful attacks on Naruto, and he gets hurt as a result.