When an ISFJ (Introverted, Sensing, Feeling, Judging) is mad, there are several signs and behaviors that you can observe. It's important to note that each individual is unique, and their expressions of anger may vary. However, here are some common indicators that an ISFJ might display when they are upset:

1. Withdrawal and Silence: ISFJs tend to internalize their emotions, especially negative ones. When they are mad, they may withdraw from social interactions and become quiet. They might avoid eye contact, give short responses, or even completely isolate themselves.

2. Passive-Aggressive Behavior: Instead of openly expressing their anger, ISFJs may resort to passive-aggressive behavior. They might make sarcastic remarks, give the silent treatment, or engage in subtle acts of defiance. This is their way of expressing their displeasure without directly confronting the issue.

3. Increased Sensitivity: ISFJs are highly attuned to the emotions of others, and when they are mad, they may become more sensitive to criticism or perceived slights. They might take things personally and react more strongly than usual to comments or actions that they would typically overlook.

4. Emotional Overwhelm: ISFJs are known for their strong emotional depth, and when they are mad, their emotions can become overwhelming. They may experience a mix of anger, frustration, sadness, and disappointment. This emotional intensity can sometimes lead to tears or outbursts, especially if they feel their values or principles have been violated.

5. Increased Attention to Detail: ISFJs are detail-oriented individuals, and when they are upset, they may become hyper-focused on small details. They might nitpick or criticize things that they usually wouldn't pay much attention to. This behavior stems from their desire for order and control when they feel emotionally unsettled.

6. Need for Reassurance: Despite their introverted nature, ISFJs seek validation and reassurance from their loved ones. When they are mad, they may seek confirmation that their feelings are justified and that their perspective is understood. They might express their anger indirectly, hoping that others will pick up on their cues and offer support.

7. Difficulty Expressing Anger: ISFJs often struggle with expressing anger directly. They may feel uncomfortable with confrontation or worry about damaging relationships. Instead, they might bottle up their anger, leading to increased stress and potential resentment over time.

It's important to approach an ISFJ with empathy and understanding when they are mad. Give them space if they need it, but also let them know that you are there to listen and support them. Encourage open communication and provide reassurance that their feelings are valid.