<p>Its never stated in the manga why he is so sick.</p>

<p>But if you read the manga you will have a theory</p>

<blockquote class="spoiler">
  <p>Tanjiro's dad have The mark, Its stated by upper moon 1 every demon slayer who has the marked will be died before they turn 25 years old. We don't know if Tanjiro's dad have the mark or even he is a demon slayer before, but because he can use breathing technique <code>Dance of the Fire God</code> it's safe to assume he was once a demon slayer. even though it doesn't guarantee if tanjiro's dad ever have The Mark, because not every Demon Slayer have The Mark.</p>
</blockquote>

CC BY-SA 4.0
2024-08-14T19:21:30.377Z
No, not really. 

Tan**ju**ro Kamado was never a demon slayer. He knew Hinokami Kagura as a dance that is performed from dusk to sunrise as an offering to the sun god once per year. He was never officially a demon slayer and never took final selection. However, Tan**ji**ro was a demon slayer, but never Tan**ju**ro.
Austin Overton
CC BY-SA 4.0
2019-11-12T18:37:25.863Z
2019-11-12T18:37:25.863Z
Aditya
<p>In the anime, we have a flashback that mentions Tanjiro's dad who was very ill when Tanjiro was still at a young age.</p>

<p>So, what is the cause of Tanjiro's dad's illness?</p>

<demon-slayer>
What illness did Tanjiro's dad have?
# What illness did Tanjiro's dad have?
Posted by: username_0 on 2019-11-12
In the anime, we have a flashback that mentions Tanjiro's dad who was very ill when Tanjiro was still at a young age.

So, what is the cause of Tanjiro's dad's illness?
**Tags:** demon-slayer
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## 1 answers
### Answer by username_1 on 2019-11-12. Score: 2 | Accepted answer
Its never stated in the manga why he is so sick.

But if you read the manga you will have a theory

> Tanjiro's dad have The mark, Its stated by upper moon 1 every demon slayer who has the marked will be died before they turn 25 years old. We don't know if Tanjiro's dad have the mark or even he is a demon slayer before, but because he can use breathing technique `Dance of the Fire God` it's safe to assume he was once a demon slayer. even though it doesn't guarantee if tanjiro's dad ever have The Mark, because not every Demon Slayer have The Mark.
> **Comments:**
> **username_2** (2024-08-14): No, not really. 

Tan**ju**ro Kamado was never a demon slayer. He knew Hinokami Kagura as a dance that is performed from dusk to sunrise as an offering to the sun god once per year. He was never officially a demon slayer and never took final selection. However, Tan**ji**ro was a demon slayer, but never Tan**ju**ro.  
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